climate change口语考试

climate change口语考试

I’m going to talk about the challenges of climate change and biodiversity loss.

All over the planet, biodiversity, from bacteria to plants and animals, from genes to species and ecosystems, is declining. According to estimates, the number of known species has declined by 40% since the 1970s, and 25% of all known species could be extinct by 2050. Worryingly, it did not occur to most people that biodiversity is a resource. Reiterating earlier findings, none of the 2002 targets to reduce the rate of biodiversity loss by 2010 has been achieved globally. But biodiversity is important, it underpins the functioning of the ecosystems on which we depend for food and fresh water, health and recreation, and protection from natural disasters.

As we know, climate change and biodiversity loss are related problems. The IPCC Fourth Assessment Report shows that climate change are happening faster than earlier believed, and the main cause is greenhouse gas emissions caused by man, most notably CO2 emissions.This means the climate will change, becoming warmer and drier in many areas, and wetter in others. Droughts will destroy croplands and millions of people will have to move to cooler countries. Scientists now suggest that extreme weather events will become more common.

Although climate change and biodiversity loss cannot be reversed entirely but the effects can be reduced by saving resources,planting more trees or using energy wisely. And t he root problem is exponential growth in human population which is estimated to grow 9 billion by mid-century. Thus it can be seen, a widly accepted population control policy is what we needed.

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