1.The climate change is caused by human activities that are leading to an enhancement of the greenhouse effect by the emission of greenhouse gases through fossil fuel combustion and deforestation.
2. Yes, human activity has been increasing the concentration of greenhouse gases in the atmosphere (mostly carbon dioxide from combustion of coal, oil, and gas; plus a few other trace gases).
3. Yes, global temperatures have increased about 0.74°C (plus or minus 0.18°C) since the late-19thcentury, and the linear trend for the past 50 years of 0.13°C (plus or minus 0.03°C) per decade is nearly twice that for the past 100 years. But the warming has not been globally uniform.
4. Yes global warming is real, but snow storms still occur because the global climate change is not uniform. Some parts still get extreme cold temperatures.
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