Global Warming

1.) Global Warming or climate change, is a subject that shows no sign of cooling down. Yes, because the rate of warming is increasing.
2. & 3.)The 20th century's last two decades were the hottest in 400 years! The Arctic is in effect of global warming because the ice keeps melting. Coral reefs, which are highly sensitive to small changes in water temperature, are dying off because of the rise in temperature.
4.)Satellites readings of temperatures in the lower troposphere shows no warning of global warming. All predictions of global warming are based on computer models, not historical data. So, global climate computer models are too crude to predict future climate changes. Efforts to quickly reduce human greenhouse gas emissions would be costly and would not stop Earth's climate from changing.