"So unless your wealth is generated somewhere along the fossil-fuel-economy, what is the objection to taking step in case climate change is caused by mankind?"

Because, unless the steps taken are of sufficient magnitude to make a real impact on the production of CO2, they will be a complete waste of time and money.
If the steps are large enough to have an effect on global warming, they will also have a profound effect on human life.
Millions will starve, great cities will become obsolete,the organisation of people into an employable entity will be a thing of the past.....anarchy will reign.

Ya takes yer choice.......Ake