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The researchers found that there were up to 70% fewer pollinators (insects), up to 90% fewer flower visits and an overall pollination reduction of up to 31% in test plants when pollution, including diesel exhaust, was present.

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Bees: Air pollution prevents pollinating insects from finding flowers

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Study finds that pollutants found in diesel fumes may cause problems for plants who rely on insects to help them reproduce

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Why Are Bees Important? - The Woodland Trust - Woodland Trust

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Bees are important for wildlife, for woods and trees and even our own lives. Find out why, discover why bees are in trouble and learn how you can help them.

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THE IMPORTANCE OF POLLINATORS

The vast majority of plant species-- almost 90%, in fact-- rely on pollinators to reproduce. Pollination is the process by which pollinators help plants to produce fruit (technically anything with seeds on the inside, so that includes things we normally think of as vegetables, like cucumbers, green beans and tomatoes) by transporting pollen from one flower to another. There are approximately 200,000 different species of animals around the world that act as pollinators. Of these, about 1,000 are vertebrates, such as birds, bats, and small mammals, and the rest are invertebrates, including flies, beetles, butterflies, moths, and bees. Pollinators provide pollination services to over 180,000 different plant species.

Pollinators help plants survive, and plants:

Produce ⅓ of our food supply by giving us countless fruits, vegetables, and nuts

Provide ½ of the world's oils, fibers (such as the cotton used to make clothes), and other raw materials

Are used to create many medicines

Provide food and cover for wildlife

Keep waterways clean

Prevent soil erosion

Produce the oxygen we breathe

Absorb CO2, counteracting global climate change

Globally, pollinators are responsible for pollinating more than 1,200 crops. 87 of the leading 115 food crops, or about 75%, depend on pollinators. Every year, pollinators contribute more than $217 billion to the global economy, and $24 billion to the US economy. If we consider the indirect products of plants, such as milk and beef from cows fed on alfalfa, the value of pollinator services in the US would increase to an incredible $40 billion.

THE SIGNIFICANCE OF HONEY BEES

Honey bees are among the most numerous and efficient pollinator species in the world. Considering that the average honey bee can visit more than 2,000 flowers in one day, these bees greatly increase the chances of a plant producing a fruit or vegetable.

Honey bees are the species most commonly used as commercial pollinators in the US. They are managed and used to pollinate over 100 crops grown in North America, and contribute $15 billion to the US economy every year. Many crops, such as almonds, which contribute $4.8 billion to the US industry each year, rely on honey bees for more than 90% of their pollination.

But honey bees don't only pollinate crops-- they also pollinate wild and native plants, thus contributing to all the environmental and societal benefits attributed to pollinators in general above.

HONEY BEE DECLINE

Honey bees are clearly vital parts of our ecosystem, acting as highly efficient pollinators of our food crops as well as for wild flora. We need bees to keep our crops and earth healthy, but in recent years their numbers have been decreasing by the billions. This decline has been linked to several factors, including parasites such as varroa mites, which bite bees and infect them with fatal viruses (read more about varroa mites here!), the use of pesticides which poison bees, and monoculture farming, which prevents them from having a varied diet.

Last year, in 2016, 44% of managed beehives in the US died. The number of managed honey bee colonies in the United States has declined steadily over the past 60 years, from 6 million colonies (beehives) in 1947 to 4 million in 1970, 3 million in 1990, and just 2.5 million today. Overwintering loss rates have increased from the historical rate of 10-15% to approximately 30%, and beekeepers have collectively lost approximately 10 million beehives.

THE ROLE OF NATIVE BEES

Did you know that there are 4,000 different bee species native to North America? These bees vary widely, from cuckoo bees to bumble bees. Some are smaller than an eighth of an inch, while others are more than an inch long. They range in color from metallic green or blue to dark brown or black to striped red or orange.

Native bees are often overlooked because they aren't domesticated, or because some of them don't look like "traditional" bees (fuzzy, black and yellow). But these bees are the original residents of North America, who quietly and industriously pollinate our crops side by side with the honey bee.

Native bees might not spend much time in the spotlight, but they make a huge contribution to our environment and our economy. In 2009, the crop benefits from native insect pollination in the United States were valued at more than $9 billion dollars.

Sadly, native bees are struggling just as much as honey bees. Many species are endangered (read more about their endangerment here), and a few have already gone extinct. The factors that harm managed honey bees also harm wild bees, such as parasites, pathogens, and poor nutrition due to monoculture farms. A study published by the National Academy of Sciences last year found that wild bees may be disappearing in California's Central Valley, the Midwest's corn belt, the Mississippi River Valley and other key farm regions. Between 2008 and 2013, modeled bee abundance declined across 23% of US land area.

Now more than ever we must find new and innovative ways to protect these national treasures and preserve the balance of our ecosystem.

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Bees and other pollinators are responsible for a third of our food and contribute over $217 billion to the global economy each year. They also pollinate almost 90% of the world's plants, keeping our environment healthy and providing habitats for countless other species. Let's show the bees some love

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Bees are part of the biodiversity on which we all depend for our survival.

They provide high-quality food-honey, royal jelly and pollen - and other products such as beeswax, propolis and honey bee venom.

As the landmark 2019 report from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) notes, "Sacred passages about bees in all the worlds' major religions highlight their significance to human societies over millennia."

Beekeeping also provides an important source of income for many rural livelihoods. According to IPBES, the western honey bee is the most widespread managed pollinator globally, and more than 80 million hives produce an estimated 1.6 million tonnes of honey annually.

And pollinators contribute directly to food security. According to bee experts at the Food and Agriculture Organization (FAO) of the United Nations, a third of the world's food production depends on bees.

When animals and insects pick up the pollen of flowers and spread it, they allow plants, including many food crops, to reproduce. Birds, rodents, monkeys and even people pollinate, but the most common pollinators are insects, and among them, bees.
Bees at risk from pesticides, air pollution
But sadly, bees and other pollinators, such as butterflies, bats and hummingbirds, are increasingly under threat from human activities.

Bee populations have been declining globally over recent decades due to habitat loss, intensive farming practices, changes in weather patterns and the excessive use of agrochemicals such as pesticides. This in turn poses a threat to a variety of plants critical to human well-being and livelihoods.

Air pollution is also thought to be affecting bees. Preliminary research shows that air pollutants interact with scent molecules released by plants which bees need to locate food. The mixed signals interfere with the bees' ability to forage efficiently, making them slower and less effective at pollination.

While the vast majority of pollinator species are wild, including more than 20,000 species of bees, the mass breeding and large-scale transport of pollinators can pose risks for the transmission of pathogens and parasites. According to the IPBES report, better regulation of their trade can decrease the risk of unintended harm.
Taking urgent action
But there are positive signs.

In May 2018, the European Union upheld a partial ban on three insecticides known as neonicotinoids to mitigate the lethal threat they pose to bees and their trickle-down effect on pollination as a whole.

This August, when world leaders gather in Kunming, China, at the United Nations Biodiversity Conference (COP 15), they are expected to finalize the post-2020 biodiversity framework, which calls for, amongst other things, the reduction of pesticides by at least two thirds by 2030.

"Increasing crop and regional farm diversity as well as targeted habitat conservation, management or restoration, is one way of combating climate change and promoting biodiversity," says UN Environment Programme (UNEP) biodiversity specialist Marieta Sakalian. "Governments need to take the lead."

It is precisely to encourage governments, organizations, civil society and concerned citizens to protect pollinators and their habitats that the UN has declared 20 May World Bee Day.

World Bee Day raises awareness of the essential role bees, and other pollinators play in keeping people and the planet healthy. The date coincides with the birthday of Anton Janša, who in the 18th century pioneered modern beekeeping techniques in his native Slovenia and praised the bees for their ability to work so hard while needing so little attention.

For further information please contact Marieta Sakalian, Senior Programme Management Officer and Coordinator for Healthy and Productive Ecosystems at UNEP.
This World Bee Day, join the conversation on Here are some actions you can take to help preserve bees and other pollinators: #WorldBeeDay, and do your part to #Savethebees

Plant nectar-bearing flowers such as marigolds or sunflowers for decorative purposes on balconies, terraces, and gardens

Buy honey and other hive products from your nearest local beekeeper

Raise awareness among children and adolescents on the importance of bees and express your support for beekeepers

Set up a pollinator farm on your balcony, terrace, or garden

Preserve old meadows, which feature a more diverse array of flowers, and sow nectar-bearing plants

Cut grass on meadows only after the nectar-bearing plants have finished blooming

Use pesticides that do not harm bees, and spray them in windless weather, either early in the morning or late at night, when bees withdraw from blossoms

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Why bees are essential to people and planet

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When animals and insects pick up the pollen of flowers and spread it, they allow plants, including many food crops, to reproduce. Birds, rodents, monkeys and even people pollinate, but the most common pollinators are insects, and among them, bees.

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How to use your garden to fight pollution

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An academic from Goldsmiths, University of London has published a guide to building an ‘air quality garden’, detailing which plants are best equipped to combat harmful pollutants.

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Air Pollution Threatens Bees' Quest for Food

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A Penn State University study found that reactions between air pollutants and plant scent molecules can make it challenging for bees to find food.

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The need for bees

We need bees. We may take them and other pollinators like butterflies and hoverflies for granted, but they're vital to stable, healthy food supplies and key to the varied, colourful and nutritious diets we need (and have come to expect).

Bees are perfectly adapted to pollinate, helping plants grow, breed and produce food. They do so by transferring pollen between flowering plants and therefore keeping the cycle of life turning.

The vast majority of plants we need for food rely on pollination, especially by bees: from almonds and vanilla to apples and squash. Bees also pollinate around 80% of wildflowers in Europe, so our countryside would be far less interesting and beautiful without them.

But bees are in trouble. There's growing public and political concern at bee decline across the world. This decline is caused by a combination of stresses - from loss of habitat and food sources to exposure to pesticides and the effects of climate breakdown.

More than ever before, we need to recognise the importance of bees to nature and to our lives. And we need to turn that into action to ensure they don't just survive but thrive.

Types of bee

Not all bees are the same. There are over 20,000 known species of bee globally. Around 270 species of bee have been recorded in the UK. Only 1 of these is the famous Honeybee.

Most Honeybees are kept by beekeepers in colonies of managed hives. The rest of our bees are wild, including 25 bumblebee species and more than 220 types of solitary bee.

Like Honeybees, the familiar Bumblebees live in social colonies - usually in holes in the ground or tree cavities.

Solitary bees tend to nest on their own, as the name suggests. Each female builds and provisions her own nest with food. Solitary bees include Mining bees which nest in the ground, as well as Mason bees and Leafcutter bees that nest in holes in dead wood, banks and walls.

Learn more with our bee identification guide.

Bees = perfect pollinators

Thanks to bees we can enjoy a range of foods from apples and pears to coffee and vanilla. And if you are wearing cotton, that's because the cotton plant your threads came from was pollinated.

"More than 90% of the leading global crop types are visited by bees."

Pollinators, Pollination and Food Production The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES)

Bees gather pollen to stock their nests as food for their young. They have special features to collect it - like branched hairs called 'scopae' or combs of bristles called pollen baskets on their legs. As bees visit plants seeking food, pollen catches on their bodies and passes between plants, fertilising them - that's pollination.

Bees are not the world's only pollinators. Flies, wasps, moths, beetles and even some birds, bats and lizards all pollinate, but they only visit flowers enough to feed themselves. Because they gather pollen to stock their nests, bees are generally the most effective pollinators since they visit many more flowers and carry more pollen between them.

Some bee species are also specially developed to pollinate particular plants and without them those plants would be less well-pollinated.

Bees and farmers

Many bees have different characteristics that make them suited to pollinate certain plants. For example, the Early bumblebee's small size and agility allow it to enter plants with drooping flowers such as comfrey. Garden bumblebees are better at pollinating the deep flowers of honeysuckle and foxgloves than most other species because their longer tongue can reach deep inside them.

Many farmers rely on a diversity of bees to pollinate their produce. For example, commercial apple growers benefit from the free pollination services of the Red mason bee. This species can be 120 times more efficient at pollinating apple blossoms than honeybees.

There is evidence that natural pollination by the right type of bee improves the quality of the crop - from its nutritional value to its shelf life. For example, bumblebees and solitary bees feed from different parts of strawberry flowers. In combination they produce bigger, juicier and more evenly-shaped strawberries.

Some bee species have an affinity to particular plants, so need particular natural habitats. For example, in the UK the scabious bee, our largest mining bee, needs the pollen of field scabious or small scabious to provision its young. These plants grow on sandy or chalky open grassland, an important habitat for a variety of bees and wildflowers that is under threat from changing land use. The loss of particular habitats like this is the main driver of bee decline.

Bees are important for more than honey

In a world without bees we would probably survive. But our existence would be more precarious and our diets would be dull, poorer and less nutritious. And not just for want of honey.

Even some plants grown to feed to livestock for meat production, such as clover and alfalfa, depend at least partly on bee pollination.

"Loss of pollinators could lead to lower availability of crops and wild plants that provide essential micro-nutrients for human diets, impacting health and nutritional security and risking increased numbers of people suffering from vitamin A, iron and folate deficiency."

Pollinators, Pollination and Food Production The Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES)

Governments and food producers talk a lot about food security, yet without bees our food supply would be insecure. The United Nations Food and Agriculture Organization (FAO) identified encouraging pollinators - particularly bees - as one of the best sustainable ways to boost food security and support sustainable farming.

All this natural crop pollination fills pockets as well as our bellies. The global market value linked to pollinators is between US$235bn and US$557bn each year. In the UK alone, the services of bees and other pollinators are worth £691m a year, in terms of the value of the crops they pollinate. It would cost the UK at least £1.8bn a year to employ people to do the work of these pollinators, yet bees do it for free.

Bees are important to a healthy environment

Bees are a fantastic symbol of nature. That they are in trouble is a sign that our natural environment is not in the good shape it should be.

By keeping the cycle of life turning, bees boost the colour and beauty of our countryside. Some 80% of European wildflowers require insect pollination. Many of them such as foxglove, clovers and vetches rely on bees.

Pollinators allow plants to fruit, set seed and breed. This in turn provides food and habitat for a range of other creatures. So the health of our natural ecosystems is fundamentally linked to the health of our bees and other pollinators.

Maintaining our native flora also depends on healthy pollinator populations. This includes wild flowers such as poppies, cornflowers and bluebells, as well as trees and shrubs. The close relationship between pollinators and the plants they pollinate is evident in the parallel declines seen across the UK and Europe: 76% of plants preferred by bumblebees have declined in recent decades, with 71% seeing contractions in their geographical range.

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Why do we need bees? | Friends of the Earth

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Bees are vital to a healthy environment and healthy economy. They're also simply beautiful and fascinating little insects. But what makes them so special?