PDQ--

You are assuming that human activity is not a main cause of global warming.

As I have indicated, if you are right, and we needlessly try to curtail human contributions to global warming, it will do little harm.

If you are wrong, and we do not try to curtail human contributions to global warming, it means world disaster--not in your lifetime, but I would hope you would have some concern for the world we leave behind.

And there are indications--not a certainty, but many indications--you may well be wrong.

If we wait until it is clear to all that human activity is worsening the problem--and it will not resolve itself---it will be far too late for the world.

It seems clear the prudent--therefore conservative--thing to do--is to do something--starting now about the human contributions to global warming.

Not to do so is a reckless gamble--with the wellbeing of the entire world. That is not a conservative approach.