Accelerated climate change is happening, plenty of evidence supporting it, none more so than the large changes in seasonal weather patterns and intensity of storms. Of course those with power will support action ONLY if they have something to gain, its pretty much human nature. The reality is that we CANNOT stop climate change, nor can we really make much of an impact on it at the current moment, the only way is to effectively "revert to bushmen" and live truly sustainable lives. To say that the entire thing is a lie may be down to your own experiences of it, if you don't see a change it isn't happening, perhaps in some places this is the case currently.
The best things to do at the moment is to invest heavily in renewable energy and maybe we could stave it off a little. Those who think that cars are the problem are pretty clueless though, the main cause of carbon emission through travel is aircraft. A stat I picked up, can't remember where said that it takes 1000000 carrier bags to be recycled to offset the carbon liberated to send 1 person from London to Adelaide. Hydrogen cell fueled cars may be an idea (politically motivated idea mind!), better than bioethanol as you need a vast amount of land to farm the sugar cane/ sugar beet on, so trees are ripped up and we see the same problem as what is happening in Brazil with the cattle farming industry.
Another possible way is to make cement and subsequently concrete more efficiently, it is one of the highest carbon producing processes on the planet, there is research going into it but more funding would produce quicker results no doubt.
I do sort of agree with the thinking that we don't have all that much control over it - but it is mainly our fault! Even the large quantity of cows are due to us farming them, so their methane production is partly our fault. Also we are the only species that could slow it a bit and make the planet habitable for a little longer.
Sorry this ended up essay-like, and not even sure if I answered anything! Bucket of worms lol