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To biodiversity regeneration using an approach that no longer has monocultures of trees but is much more diverse, but also integrated with regenerative agriculture and agroforestry techniques which are critical, all of which can be again integrated with community, rural community enhancement and working with small farmers. we've got this big, big critical, i think it's fair to say, vital conference happening in glasgow, world leaders coming together to make decisions about what they are going to do in terms of tackling climate change — what would a successful outcome be? well, as i've been s...

we're in mesa, arizona, tonight's cnn arizona republican presidential debate. it's been about a among since they last faced off and since then even more upheaval. rick santorum is now the surging candidates and the one for mitt romney to beat tonight. both men we are campaigning down to the wire and may have given each other press ammunition. he's here with us, going through the details. what's the latest? >> for the top two candidates, the devil is in the debails. two potential flash points. tonight mitt romney's new tax plan and rick santorum's faith-based brand of politics. he mad...