Nobody doubts that the earth goes through "natural" warming and cooling cycles that last for millions of years. Such cycles cause slow change, to which the earth can adapt, continuing to sustain life.
The problem right now - and this is what the vast majority of scientists seem to agree on - is that carbon emissions are affecting our climate to such an extent that the planet cannot adapt fast enough to compensate.
There is huge consensus within the scientific community that (a) warming is currently happening on an unprecedented scale, and (b) the acceleration in global warming is caused by carbon build-up, for which human activity is responsible - destruction of forest, intensive farming, fossil fuels, etc. etc.
If we are to avoid the tipping point (where the sun will take over, despite anything we do) we need behaviour change and/or a technological solution. The fact that business opportunities will arise as a result of this is inevitable - but irrelevant in the long run.