Analysis on the Issues of Global Warming

Global warming is an explicit fact.Even though all published IPCC reports are holding and confirming the same viewpoint that global warming is the result of greenhouse effect due to human activity,it’s difficult to quantify respective relative contribution between human activity and natural factors.It seems that global warming trend in recent 30 years is due to greenhouse effect caused by human activity.Changes of climate system are so complicated that debates and controversies remain inevitable on the issues that how human activities affect climatic change.Hence,global warming effects should be treated objectively and with more attention to make the uncertainties clear.