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Our head and that gets converted to sulphuric acid. and reflect away sunlight. >> that last part is the key. they help to cool the planet. you might remember that filipo volcano that erupted in 1991. well -- >> after a big volcano that put sulphur in the atmosphere, the whole world got cooler for a year. not just cooler but the productivity of plants and ecosystems around the world went up that year. >> the challenge to keith and his fellow scientists is how to get particles into the atmosphere that will do the same thing. keith has an idea. send planes up into the air that release an aerosol ...

It's an issue of civil rights and human rights. >> do you find yourself defe defending ted olson? >> no. i find myself defending ted olson to my republican friends. >> politics aside, their wives joke that they're like an old married couple. they go biking together and both enjoy the finer things. >> what do you like about each other? >> where shall we start? shall we start with the wine or the bike trips. >> start with the wine. after a long day, a glass of -- >> definitely a glass. >> chardonnay. >> reporter: they have known each other for decades and super lawyers practicing in a rare fieed...