Question

Man is partly responsible for global warming. Give reasons.

Answer 1

Looking at the composition of the atmosphere today, we can see a sharp increase in the volume of the main greenhouse gases, such as carbon dioxide and methane. Comparing it to the measurements we get from around 800,000 years of polar ice, we can actually see there’s a clear difference. We’re well beyond the range of glacial/interglacial variation for these gases. Today, atmospheric carbon-dioxide is about 400 ppm, 40% higher than the normal level during an interglacial. It’s comparable, for instance, with the level during the warmest stages of the Pliocene around 3 million years ago, when the climate was 2 to 4 °C hotter than today and sea levels were much higher. The global carbon cycle has been totally disrupted by human activity. The ocean absorbs about a quarter of the carbon dioxide we release into the atmosphere, and vegetation and land another quarter, so half of our emissions remain in the atmosphere. We can see our activity is decisive – especially our fossil-energy consumption, deforestation and cement production, which are the three main human activities emitting carbon dioxide. As for atmospheric methane – the second most important greenhouse gas emitted by human activities – it’s now at two and half times its natural level. So there’s no doubt that the change in atmospheric composition is driven by our industrial and farming activities, to simplify. And climate change is just beginning. The climate will continue to react to the greater atmospheric greenhouse effect we’ve caused. Looking at possible future developments, we anticipate from 2 to 4 °C or 5 °C of warming by 2100. Compared to past climate change, warming of more than 2 °C by 2100 would be a truly extraordinary event.’


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Answer 2

Here is your answer mate.

I hope it may help you