The Earth is heating up, and most scientists believe that it's all our fault.0:31
When we burn fossil fuels, greenhouse gases such as carbon dioxide increase and surround the Earth like a thick blanket.0:36
This traps heat and temperatures rise.0:46
Scientists say that in the next 100 years, average temperatures will rise by about 3 degrees Celsius.0:49
This doesn't sound like a lot, but it means big trouble.0:57
Ice is already melting, sea levels are rising, and the climate is changing.1:02
How exactly is all this changing our world?1:08
And what will happen if we don't act in time?1:12
Cities Under the Sea.1:16
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 2100.1:18
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.1:31
Already, two small Pacific islands have disappeared under the waves.1:42
Coastal cities including Shanghai, Bangkok, New York, and London will also be under threat.1:47
In Greenland, ice is melting 3 times faster than just a few years ago.1:55
If the ice sheets of Greenland and Antarctica ever melt completely, sea levels will rise about 60 meters.2:01
That's enough to cover almost every major city on Earth.2:09
Wildlife in great danger.2:15
Global warming is a serious threat to wildlife.2:18
In particular, Arctic polar bears are in great danger.2:21
The ice that they hunt from is melting very fast, so they have to swim further and further to find food.2:26
Many starve or drown.2:34
By 2100, summer ice may disappear completely in the Arctic, and polar bears probably won't survive.2:36
Changing weather patterns and rising sea levels threaten thousands of other species too.2:45
Some people believe that 30-40% of the world's species could become extinct because of climate change.2:52
Heavy rain and snow, storms, heat waves, droughts, more powerful hurricanes and tornadoes.3:05
These all happen a lot more frequently these days, and more and more climatologists now believe this is because of global warming.3:13
When sea temperatures rise, there are changes in the atmosphere.3:23
If you live in a chilly place, you might think global warming sounds great.3:28
But climate change doesn't just mean hotter temperatures.3:33
It means more and more extreme and unpredictable weather.3:37
So, what on earth can we do?3:43
Reduce your carbon footprint.3:46
Cycle, walk, or take a bus instead of travelling by car.3:48
Use energy-saving bulbs and wear more clothes instead of turning up the heat.3:53
Experts say we must do something now.4:00
If sea levels start rising even faster, it will be impossible to stop.4:04
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