The Earth is heating up, and most scientists believe that it's all our fault.0:32
When we burn fossil fuels, greenhouse gases such as carbon dioxide increase and surround the Earth like a thick blanket.0:38
This traps heat and temperatures rise.0:47
Scientists say that in the next 100 years, average temperatures will rise by about 3 degrees Celsius.0:51
This doesn't sound like a lot, but it means big trouble.0:59
Ice is already melting, sea levels are rising, and the climate is changing.1:03
How exactly is all this changing our world?1:10
And what will happen if we don't act in time?1:13
Cities Under the Sea.1:18
According to recent climate reports, melting ice from the polar ice caps and mountain glaciers could cause sea levels to rise by about 1 metre by 2100.1:20
If this happens, whole countries such as the Maldives will vanish, and millions in low-lying areas, like parts of Bangladesh, will lose their homes.1:32
Already, two small Pacific islands have disappeared under the waves.1:43
Coastal cities including Shanghai, Bangkok, New York, and London will also be under threat.1:48
In Greenland, ice is melting 3 times faster than just a few years ago.1:56
If the ice sheets of Greenland and Antarctica ever melt completely, sea levels will rise about 60 meters.2:03
That's enough to cover almost every major city on Earth.2:11
Wildlife in great danger.2:16
Global warming is a serious threat to wildlife.2:19
In particular, Arctic polar bears are in great danger.2:23
The ice that they hunt from is melting very fast, so they have to swim further and further to find food.2:27
Many starve or drown.2:35
By 2100, summer ice may disappear completely in the Arctic, and polar bears probably won't survive.2:38
Changing weather patterns and rising sea levels threaten thousands of other species too.2:47
Some people believe that 30-40% of the world's species could become extinct because of climate change.2:54
Heavy rain and snow, storms, heat waves, droughts, more powerful hurricanes and tornadoes.3:06
These all happen a lot more frequently these days, and more and more climatologists now believe this is because of global warming.3:14
When sea temperatures rise, there are changes in the atmosphere.3:24
If you live in a chilly place, you might think global warming sounds great.3:29
But climate change doesn't just mean hotter temperatures.3:34
It means more and more extreme and unpredictable weather.3:38
So, what on earth can we do?3:44
Reduce your carbon footprint.3:47
Cycle, walk, or take a bus instead of travelling by car.3:50
Use energy-saving bulbs and wear more clothes instead of turning up the heat.3:55
Experts say we must do something now.4:02
If sea levels start rising even faster, it will be impossible to stop.4:05
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