Could geo-engineering help save the planet?

Scientists around the world are researching ways of manipulating the climate to tackle global warming.

Some experts are concerned there are too many risks associated with it, fearing it could mess with global weather patterns or actually warm some regions.

BBC Weather has seen a large increase in social media comments around geo-engineering since January .

The technology to perform marine cloud brightening on a small scale with fans and sprayers already exists.

But the other method of solar radiation management - stratospheric aerosol injection - would need greater advances to have the desired impact.

It involves artificially adding aerosols such as sulphate into the stratosphere, which extends from 6-12 miles ( 10-20 km) to 31 miles ( 50km ) above the Earth .

Millions of tonnes of sulphur dioxide would need to be injected to have any impact.

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