The concern is that compared to what's necessary to change the apparent course of the planet, what has been done so far is basically nothing. On a global scale the amount of change necessary is orders of magnitude larger than what has changed so far, and it needs to happen fast (and the problem is getting worse: the second derivative isn't even in the right direction in that carbon emissions per year are still increasing globally. Given what we know about the climate it's not clear if we would avoid substantial shifts even if we reset the CO2 concentration in the atmosphere to the levels from the start of the century). And the fact is much more action could be easily taken even right now, but some governments are still in denial that there's even a problem in the first place (and the fact is this is a problem which needs government action: individual consumers do not have the power to change the behaviour of industry, even if well organised).