单选题：根据以下材料，回答题Around 45% of the UK's carbon dioxide emissions co

根据以下材料，回答题
Around 45% of the UK's carbon dioxide emissions come from the energy people use every day -- at home and when they travel. In order to generate that energy, fossil fuels (coal, oil, and gas) are burnt, and these produce greenhouse gases -- in particular carbon dioxide (CO2). Car emissions are a major problem, but the truth is that more CO2 come from the energy used at home.
The average household creates around five and a half tons of CO2 a year, and it is the same CO2 that is changing the climate and .damaging the environment.
CO2 and various other gases wrap the earth in an invisible blanket helping to prevent heatfrom escaping. Without this greenhouse effect, the average temperature on the Earth would be around – 18℃, compared with the current average of around +15℃. The composition of this blanket of gases has remained relativity constant for many thousands of years. However, since the industrial revolution began around 200 years ago, people have been buming increasing amounts of fossil fuels, thus releasing more CO2 and other greenhouse gases in the process. This has increased the heating effect of the blanket, trapping more of the sun's energy inside the Earth's atmosphere in turn the Earth's temperature has increased more rapidly in a shorter period of time than it has for thousands of years.
In 2008, the total UK CO2 emissions were 533 million tons. 27% (144 million tons) of those emissions came from the energy used to heat, light, and power homes. Tr.ansport emissions caused by passenger cars, buses and motorcycles accounted for a further 16% (87 million tons) of the UK's CO2 emissions. These figures show that a significant amount of CO2results from ordinary citizens' carbon footprint in their daily activities and lifestyle.
The effects of climate change can be seen all around us. Weather patterns are becoming more and more fractured and uncertain, and over the last century trends in warm weather have become increasingly common. In the UK in the last 40 years, winters have grown warmer, with much heavier rainfall. One of the clearest shifts over the last 200 years is towards summers that are hotter and drier,causing pervasive ( 普遍的 ) water shortages. Recent years have been hottest since records began, and during August 2003, the hottest ever outdoor temperature in the UK was recorded 38.5℃.
What is the author's main aim? A．To explain the greenhouse effect.
B．To describe the effects of climate change in the UK.
C．To show how much CO2is produced by ordinary people's activities.
D．To illustrates how industrial activity creates the greenhouse effect.