I'm firmly part of the 'natural cycle' camp when it comes to climate change. Is it possible humans are helping it along? Sure, but our activities as a species are just a small number of factors among the many that affect Earth's climate.
Now, the OP wanted to know about our thoughts on preventative measures, what's wrong with taking steps, etc? In short, if the motives are pure there's nothing wrong with it. Renewable energy sources and cleaner air is a win for everyone. Unfortunately advocates for these measures in our governments in particular the United States government are not actually interested in 'saving the planet'. They're interested in the things most politicians covet: Money, power in perpetuity, and generally tossing out slogans and catch phrases to keep citizens unsure and fearful.
I'll give an example, our power grid in the US is deteriorating and needs a major overhaul. Now, if someone, tomorrow, invented a solar panel/generator combination that was cheap to produce and efficient enough to power the average home or business by itself, do you think our government would rejoice? No, I can virtually guarantee it would be quickly and quietly killed as a project and never be allowed on the free market. Independance is the opposite of what most of our leaders want for us.
That's my issue with all of this, and while you may or may not agree with my examples I doubt many of you can honestly say you believe politicians really want to save the planet. This is just another way of milking taxpayers for funds and expanding government power. It's convenient because climate change is in the news often, so people tend to remember it. I'm all for doing little things that we can all do to reduce our environmental impact, but our leaders only care about it as long as there's money in it for them.