Humans must be to blame for climate change, say scientists

Climate scientists have delivered a powerful riposte to their sceptical critics with a study that strengthens the case for saying global warming is largely the result of man-made emissions of greenhouse gases.

The researchers found that no other possible natural phenomenon, such as volcanic eruptions or variations in the activity of the Sun, could explain the significant warming of the planet over the past half century as recorded on every continent including Antarctica.

It is only when the warming effect of emitting millions of tonnes of carbon dioxide into the atmosphere from human activity is considered that it is possible to explain why global average temperatures have risen so significantly since the middle of the 20th century.

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