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In pictures: Global sunshade
Introduction

For as long as humans have been on the Earth they have taken shelter from the Sun.

But with global warming now a major concern, imagine if you could do this for the whole planet.

One man believes it can be done - British born astronomer Roger Angel.

He thinks that by putting a giant sunshade - consisting of 16 trillion glass discs in space, he can limit some of the Sun's energy reaching Earth.

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