(一)
For the past decade，there have been heated debates about whether our planet is heating up and whose fault it is.Many scientists，politicians，journalists，and famous entertainers are all saying that our planet is in trouble and that human beings are the cause.They say we must act now to reduce our use of fossil fuels，such as coal and oil，before it is too late.In 1997，a group of scientists' ideas were used to write the Kyoto Protocol(《京都议定书》)，
an agreement that explained our role in the Earth's changing atmosphere and set international limits for gas emissions from 2008 to 2012.Some countries have decided to continue these reductions until 2020.
At the same time，a few governments and some scientists argue there is no evidence that humans are causing recent changes in climate and weather.These scientists don't think we really need to change our lifestyle；that is，we should continue to drive，fly and live normally.They present evidence that proves that the Earth is going through a normal heating and cooling cycle，as it did throughout its history.
So，is there a link between humans and the climate change or not？To reach an educated opinion，it is important to think about the people who make scientific claims and what their purpose may be.For example，some say the scientists who warn about global warming are trying to scare people in order to get attention and money for their research.And some of them get some money from companies that produce these fossil fuels.For example，ExxonMobil，one of the world's biggest oil companies，has spent millions of dollars to support the groups that discredit the idea of global warming.
Clearly，scientific information can be affected by the interests of individual scientists.When we hear reports on climate change，we must use good judgment and ask ourselves where the facts are coming from.We must interpret the research，make informed decisions，and most importantly，participate in the debate.
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[参考范文]
With intense controversy over the origin of global warming，many people attribute it to human activities and appeal for immediate action.(要点1)On the contrary，in view of the lack of concrete proof，objectors deny the link between them and doubt the necessity of changing lifestyle.(要点2)With personal interests disturbing scientific objectivity，scientists' motivation strongly influences their academic preference.(要点3)Therefore，to have an objective judgment，it takes both our critical analysis of the research and active participation in the debate.(要点4)
