Right now there IS evidence that human activity is, at a minimum, contributing to the very obvious climate changes. It 'may' be that some warming is also natural, but no matter what the specific % for any one cause, it stands to reason that acting as though we have some input to the problem(s) and doing all we can to move away from fossil fuels and other environmentally unfriendly activities would be a good idea!

That is, "it wont hurt, and it will help some things". The big delay is with companies who have their $$$$$ invested in old technology and old habits. (Can anyone remember the arguments about tobacco?)