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Climate is more associated with a region than with an entire planet. Consider the difference between the climate at earth's polar regions, and its climate in the tropics.

Overall, however, the global climate is a little bit warmer now than it was 50 years ago. In the 1960s primary energy generating facilities pumped a lot of particulate into the air, along with their CO2 emissions. This particulate had an overall short term cooling effect. As the particulate settled out and energy production methods were improved for cleaner air, the heat trapping effects of CO2 gradually became more preponderant.

Note, the change remains small, only a fraction of a degree overall. But the CO2 already liberated will continue having a warming effect even if we suddenly stopped all new emissions. The effect is similar to that of a blanket. You add a blanket on a cold night, you don't warm up immediately. It is expected to take decades for the earth to acclimate to current greenhouse gas concentrations.

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How did Himalayan ranges form?

The Himalayan ranges were formed due to the collision of the Indian tectonic plate with the Eurasian tectonic plate around 50 million years ago. The intense pressure and force from this collision caused the Earth's crust to uplift and fold, creating the tall mountain range we see today.


How much of the earth was covered in rainforests 100 years ago?

Well, 50 years ago 14% of the earth was covered in rainforests - all around the equator. But 100 years ago it was not destroyed at all - it probably just completely covered the whole equator!


Which continent is the youngest on Earth?

Australia is considered the youngest continent on Earth, having separated from the supercontinent Gondwana about 50 million years ago.


Is the air cleaner today or was it 20 years ago?

In the USA, the air is much cleaner now - as anyone who was alive 40-50 years ago will tell you, especially around some of the bigger cities. This is due to several major environmental laws passed in the 1970's. Elsewhere in the world, particularly in the developing world and especially China and India, the air is much dirtier than it was 20 and 30 years ago. Some of the cheapest energy and manufacturing techniques are also the dirtiest. These countries are just now beginning to deal with their air pollution simply out of necessity. Poor air quality takes a tremendous toll on human health when it is so severe, and you can attach a monetary value to these damages.


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