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most of the world's supply of food is produced by growing crops or by keeping animals

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most of the world's supply of food is produced by growing crops or by keeping animals

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during the last century the quantity of food produced has greatly increased

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during the last century the quantity of food produced has greatly increased

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we must increase the food we produce because the world's increasing population needs to be fed

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we must increase the food we produce because the world's increasing population needs to be fed

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with machinery such as tractors and combine harvesters one farmer can cultivate a much greater area of land in a much shorter time than using manual labour 

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with machinery such as tractors and combine harvesters one farmer can cultivate a much greater area of land in a much shorter time than using manual labour 

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farmers are also using chemicals to improve the growth of their crops

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farmers are also using chemicals to improve the growth of their crops

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chemical fertilizers add more mineral ions to soils

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black-footed ferrets are predators that feed almost entirely on burrowing rodents called prairie dogs

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black-footed ferrets are predators that feed almost entirely on burrowing rodents called prairie dogs

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farmers killed large number of prairie dogs because they thought they competed with their cattle for grass

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in 1974 black-footed ferret was declared extinct in the wild, but in 1981 was discovered a small population of them in Wyoming

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in 1974 black-footed ferret was declared extinct in the wild, but in 1981 was discovered a small population of them in Wyoming

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the black-footed terrets were given protection

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some of the ferrets were taken to zoos, were they were given the right conditions to help them to breed

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today the black-footed ferret is out of danger

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today the black-footed ferret is out of danger

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many of the offsprings were reintroduced into suitable habitats in several states, thus avoiding the extinction

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INSECTICIDES are sprayed onto crops to kill insects pests that might reduce yelds or make the crop look less appealing to buyers; HERBICIDES are sprayed to kill weeds, which would compete with the crop plants and reduce their growth

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although these chemicals are expensive, the cost is outweighed by the increased quantity and quality of the crops

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selective breeding increase world food production

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selective breeding increase world food production

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it has produced crop plants that can grow in poor soils, or that are resistant to diseases, moreover modern wheat varieties produce far more grain per plant than older ones ever did

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monoculture is when single variety of crop plants are grown in large area

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(e quello che ascoltate non è detto in una sola lingua)

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L'inno per l'ambiente è sulle note di Bella Ciao: il coro dei bambini torna virale

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"Do it now", fallo ora. E' il titolo della canzone tornata virale in questi giorni con l'avvicinarsi del "FridaysForFuture", la manifestazione su scala globale ispirata dalla sedicenne Greta Thunberg a favore dell'ambiente. "Dobbiamo svegliarci, dobbiamo aprire gli occhi, dobbiamo farlo ora.

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all living things affects the living and non-living things around them

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all living things affects the living and non-living things around them

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rabbit fleas carry the virus which cause myxomatosis

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rabbit fleas carry the virus which cause myxomatosis

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so they can affect the size of a rabbit population, but also the size of the fox population if the foxes depend on rabbits for food

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the biggest event of living organisms on the environment happened 1500 million years ago

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the biggest event of living organisms on the environment happened 1500 million years ago

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at this time, the first living cells tha could photosynthesise evolved, so began oxygen production which gradually accumulated in the atmosphere

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the appearance of oxygen in the air meant that many anaerobic organisms could now only live in particular parts of the earth which were oxygen-free

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the appearance of oxygen in the air meant that many anaerobic organisms could now only live in particular parts of the earth which were oxygen-free

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such as deep layers of mud

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it meant that many other kins of organisms, which used oxygen for respiration, could evolve

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it meant that many other kins of organisms, which used oxygen for respiration, could evolve

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within the last 10000 years another organism had an enormous impact on the environment

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within the last 10000 years another organism had an enormous impact on the environment

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humans, through their activities, have been changing environment in a very significant way

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habitats are destroyed when we use land for other purposes

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habitats are destroyed when we use land for other purposes

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for growing crops, farming livestock, building roads, houses and factories, or for extraction of minerals and fuels, or for the adding of pollutans to land and water

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loss of biodiversity

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the cutting down of large numbers of trees is called 

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the cutting down of large numbers of trees is called 

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most concerns about deforestation has been about the loss of tropical rainforests

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most concerns about deforestation has been about the loss of tropical rainforests

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when an area of rainforest is cut down, the soil under the trees is exposed to the rain, so happens soil erosion and this make very difficult to the rainforest to grow back again

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when an area of rainforest is cut down, the soil under the trees is exposed to the rain, so happens soil erosion and this make very difficult to the rainforest to grow back again

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moreover, the soil can also be washed into rivers, causing flooding for their silting

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THE GLASS AROUND THE GREENHOUSE BEHAVES LIKE THE CARBON DIOXIDE IN THE ATMOSPHERE

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gases contributing the greenhouse effect

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gases contributing the greenhouse effect

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how the greenhouse gases concentrations in the atmosphere have changed since 1750

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how the greenhouse gases concentrations in the atmosphere have changed since 1750

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why we must be worried about the enhanced greenhouse effect

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why we must be worried about the enhanced greenhouse effect

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to be continued

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exposure to large amounts of radiation from these substances can cause radiation sickness and burns, but also mutation rates in DNA in our cells, which may lead to cancer

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ionising radiations can increase mutation rates in DNA

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ionising radiations can increase mutation rates in DNA

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because they damages the DNA molecules in living cells

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the least ionising is the gamma, but it is the most penetrating, the contrary is for for alpha radiation

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to be continued....

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...but also rodenticides

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the population of insects or fungi may grow very rapidly because they have an inexhaustible food supply

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if they are not used with care, some pesticides can do a lot of damage to the environment

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it doesn't breaks down, but remains in the bodies of the insects or in the soil. any consumer eat the DDT too, and each time they eat an insect, more DDT accumulates in their tissues

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this means that it is harmful to insects and other living things

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in britain, DDT affected the breeding success of peregrine falcons

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in britain, DDT affected the breeding success of peregrine falcons

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so the peregrine falcon population dropped very quicly

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DDT make the egg shells very weak

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may contain heavy metals: lead, mercury, cadmium...

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if they get into rivers, streams or the sea, they may kill almost every living thing in that area

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the practice of planting and maintaining forested areas for the benefit and sustainability of future generations

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imposing strict limits on, or even suspending, catches of overfished species, and prohibiting catches of juvenile fish

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Save The World’s Fish Stocks #29 Conservation - Wildlife Explorer Fold-Out Card

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Group 8 - Conservation IssuesHole Punched To Fit In 3 Ring BinderMake: Imp / International Master Publishers LtdYear : 1999Folded Size Approx : 255mm X 230 mmUnfolded Size Approx : 255mm X 442 mmExcellent Condition, May Have Slight Damage Around The Hole PunchFront And Back Of Card Shown In ScanIndividual/Single CardFree Shipping On Any Amount Of Additional Cards/StickersCombined Shipping Discount Only Applies To Items Purchased On The Same Invoice. We Are Unable To Refund Additional Postage Once Payment Is Made. PLEASE NOTE PAYMENTS WHICH TOTAL OVER £15 REQUIRE RECORDED/SIGNED FOR DELIVERY.