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A look at the corrosive and harmful effects of acid rain. How one country's industry can cause lakes, rivers and landscapes in another country to become acidified.

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Large hail, strong winds, heavy rains and flash floods are part of dangerous weather systems across the nation.

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Back here at home tonight, and we're tracking severe weather on the move at this hour. Tornado and severe thunderstorm watches across at least four states now. And this image from south Dakota. Look at this. Time lapse showing this super cell forming. And those violent thunderstorms in the last 24 hours. Lightning bolt hitting the capital there. Let's get to ginger zee, tracking the trouble spots in the plains and right here in the east. Reporter: Severe thunderstorm reports already from Florida to North Carolina, I'll take you straight to the maps, David. There's a lot of energy happening in the northern plains. You see that tornado watch in North Dakota and South Dakota. The severe thunderstorm watches that include Nebraska, that's the area we're watching tonight that you can see in the Orange there. Going to sink to the south tomorrow. The threat actually elevated for northwest Kansas, southwest Nebraska. We'll be watching that tomorrow. It's that active jet stream out in the west that's dipped south. Texas drying out. And brought all of that rain. The heavy storms, flash flooding, even. Two to three inches through Friday, right there, north Carolina, southern Virginia. All right, ginger, thank you. We turn now to the fiery

This transcript has been automatically generated and may not be 100% accurate.

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Video: Severe Thunderstorm Reports and Tornado Watches

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Back here at home tonight, and we're tracking severe weather on the move at this hour. Tornado and severe thunderstorm watches across at least four states now. And this image from south Dakota. Look at this. Time lapse showing this super cell forming. And those violent thunderstorms in the last 24 hours.

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The effects of air pollution on people's health. Bangladesh has been described as walking around in a war zone and 17th Century London was described as hell on Earth. What you need to know about smog.

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A winter storm, an event in which varieties of precipitation are formed that only occur at low temperatures, such as snow or sleet, or a rainstorm where ground temperatures are low enough to allow ice to form. In temperate continental climates, these storms are not necessarily restricted to the winter season, but may occur in the late autumn and early spring as well. Very rarely, they may form in summer, though it would have to be an abnormally cold summer.

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The Army has been deployed to rescue hundreds of drivers, as sub-zero conditions continue across the UK.

The M62 is closed "indefinitely" near Manchester while the military helps police free motorists stranded in snow.

Major incidents have been declared in Wiltshire, Hampshire and Avon and Somerset, as blizzards brought roads to a standstill. Elsewhere passengers were trapped on freezing trains.

Flights and trains have been cancelled and thousands of schools are shut.

Prime Minister Theresa May has thanked everyone "going the extra mile".

There are yellow weather warnings for snow, ice and wind in place across the UK throughout Friday, with a Scottish warning in force until 23:55 GMT on Monday, but there are no amber alerts currently in place.

South Western Railway has announced that its services will be closing down by 20:00.

The Environment Agency has issued seven flood warnings and 22 flood alerts for coastal areas in the south-west and north-east of England.

Severe flooding has been reported in Penzance, due to high river levels and large seas.

The Met Office has reported the UK has officially broken its record for the lowest temperatures for March in a 24-hour period.

Temperatures in the town of Tredegar in south Wales did not get above -4.7C.

Near-miss bus driver: 'My training kicked in'

In pictures: Storm Emma arrives in UK

Follow live updates here

Death toll rises as big freeze grips Europe

Police forces across the UK have told people to travel only if necessary.

There is a warning of black ice on the M6, while some of the worst problems are near Rochdale on the M62 - which is closed as stranded vehicles are cleared - and on the A303 near Ilminster and the A31 in the New Forest - where the Army has been helping to rescue drivers.

On the M62, volunteers from Milnrow, Rochdale, took hot drinks, food and blankets to some of those stuck - including a bottle of warm milk for a five-week-old baby.

Much of Wales has been brought to a standstill, where routine operations have been cancelled as health boards make a plea for staff to attend work. Travel conditions in Scotland remain treacherous.

National Grid's first "gas deficit warning" for eight years has been withdrawn. The power operator issued the warning on Thursday, saying it might not have enough gas to meet demand due to the cold.

Passengers who boarded a South Western Railway train to Weymouth at 17:05 GMT on Thursday were still in their carriages on Friday morning after their train broke down in the middle of the night.

Robert Luther, 48, from Poole, was returning from work in London.

"We've been stuck here for 11 hours - it must have been close to zero degrees in here last night," he told the BBC.

"We had 3 foil blankets between 30 of us. A few of us have put plastic bags over our socks and inside our boots - a tip we heard on BBC News yesterday."

Another passenger, Dave Taylor, said people had been trying to sleep, but it was "so, so cold".

"A fire brigade medic had arrived to check no casualties," he said. "No power. No lights. Nothing. Refreshments have run out."

Meanwhile on another train, Shane White finally arrived in Bournemouth having left Cardiff some 16 hours earlier.

At the scene
Robert Hall, BBC News, on the A303 in Wiltshire
High in the Wiltshire hills, a long line of darkened vehicles snakes down the snow-covered carriageway near the village of Mere.

We, like hundreds of drivers have spent 12 hours in stationary traffic. The A303 is littered with vehicles that could go no further, blocking the plough and gritters trying to reopen the road in blizzard conditions.

One man we spoke to was trying to reach a care home whose heating had failed, others settled down to sleep in their cars.

There's absolutely no news. We don't know what's happening, people just want some information.

The so-called Beast from the East met Storm Emma on Thursday.

A seven-year-old girl was killed in Looe, Cornwall, after a car crashed into a house in icy conditions.

In Edinburgh, troops were deployed to transport 200 critical care hospital workers to and from their shifts at two hospitals on Thursday evening.

Some 15 law courts across Scotland have cancelled trials on Friday.

Electricity North West said 5,000 customers were off-supply in Buxton, while Western Power Distribution figures showed about 4,000 properties in Wales and south-west England without power on Friday morning.

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It's snowing - can I refuse to come to work?

A highly unusual red weather warning for snow for south-west England and south Wales was lifted at 02:00 GMT.

What is happening with the trains?

Across the UK, more than 20 rail operators are running a reduced service.

National Rail is advising passengers to check their service before travelling. Some train operators are urging people not to travel at all.

Virgin Trains is not running any services north of Newcastle on Friday, with their route between Carlisle and Scotland - affecting the London to Glasgow and London to Edinburgh routes - closed with no replacement buses running. Passengers on east coast routes are urged not to travel until Saturday

Arriva Trains Wales has suspended some services all day on Friday. Some routes are are running on a reduced timetable.

Great Western Railway said it was running an "extremely limited service" and advised against travel

Heathrow Express services between London Paddington and Heathrow Airport are running less frequently

East Midlands Trains are unable to run any trains between Nottingham and Skegness

There are numerous delays and cancellations on the Northern network

ScotRail will not run any trains in the amber warning area during the Friday morning peak

No CrossCountry services will run in Scotland on Friday. There will also be no trains running north of Newcastle until 16:00.

How are the airports affected?

More than 4,000 flights have been cancelled across Europe since Tuesday and the disruption is set to continue into Friday.

Glasgow Airport: Open after "the worst snowfall in its history" but there are delays and cancellations

Edinburgh Airport: Open with numerous delays and cancellations. All EasyJet and Ryanair flights are cancelled

Dublin Airport: All flights have been suspended until Saturday

Cardiff Airport: Closed

Bristol Airport: Runways are now open but there are significant disruptions. EasyJet has cancelled all flights to and from the airport

East Midlands Airport: It has warned passengers of cancellations and delays

Leeds Bradford: The airport was closed overnight but is hoping to open Friday morning

Heathrow Airport: The airport advises passengers to check before travelling

Gatwick Airport: There are delays and cancellations

City Airport: Multiple cancellations and delays are expected

What is the forecast?

The Met Office says the cold weather could last into next week and possibly the following week.

Up to 50cm (19 inches) of snow is forecast in parts of Dartmoor, Exmoor and uplands parts of south-east Wales accompanied by gales or severe gales in exposed areas.

Gusts of 60-70mph are possible in parts of northern England and Wales.

Up to 10cm (four inches) of snow is forecast in parts of Scotland and northern England, with up to 25cm over the area's hills.
How has the cold weather affected you? Share your pictures, video and experiences by emailing haveyoursay@bbc.co.uk .
Please include a contact number if you are willing to speak to a BBC journalist. You can also contact us in the following ways:

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Send pictures/video to yourpics@bbc.co.uk

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The Army has been deployed to rescue hundreds of drivers, as sub-zero conditions continue across the UK. The M62 is closed "indefinitely" near Manchester while the military helps police free motorists stranded in snow. Major incidents have been declared in Wiltshire, Hampshire and Avon and Somerset, as blizzards brought roads to a standstill.

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Welcome to the Valley of Death, a place that, according to experts, is among the hottest on our planet and in which meteorologists have their eyes set these days in the expectation that mercury will hit a new record because of the intense heat wave that is affecting the southwestern United States.

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Heat, Sick of Moving - BBC World Service

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How heat and sun exposure can damage your health

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The negative health effects of the cold. In Antarctica, temperatures drop as much as -100ºC. Your blood vessels start to shut down and your muscles contract to keep warm

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Cold, Sick of Moving - BBC World Service

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Dear students, today you are going to be reporters, presenters and weather broadcasters! Be ready to appear on TV! In this padlet clipboard you have the topics related to weather phenomena from which you will have to choose one. Get ready to research on your climate issue and prepare a nice TV show explaining it (groups of 4 - 1 presenters, 1 interviewed, 1 broadcaster, 1 reporter (who will be in situ in the affected place). YOU NEED TO UPLOAD HERE YOUR TV SCRIPTS USING THE VOCABULARY FROM YOUR SPECIFIC WEATHER PHENOMENON.

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Heavy snow is expected across much of the UK towards the end of the week. Some areas could see up to 6in (15cm) of snow on Friday. BBC weather presenter Carol Kirkwood has the forecast from 06:00 GMT Wednesday.