As for how “halal” this is, I think it’s probably all down to matters of the sect. Wahhabis in Saudi Arabia railed against the introduction of radio, only to campaign in favour of it when King Fahd showed them it could broadcast Qur’anic recitations. They did the same when the first TVs were introduced. Now the mutaween has its own webpage (despite this, pretty much every website is blocked in Saudi – not only can you not see porn, but anything related to democracy, or alternative religions, is blocked). If we keep with the wahhabi notion that “any innovation is an error”, then this would be rejected as “shirk”. However, I’m sure there are mainstream Muslims who would be in favour of such a move. Either way, it comes up against a fairly fatalist stream in Islam summarised in the phrase “inshallah” – if God wills it, it will happen, if not, then it won’t. As such, surely god will either let the climate change, or not, regardless of what we mere mortals do?