On topic:
There is no valid physical reason (such as the oft-cited EROEI, or lack of sufficient land, or intermittency, all solvable and not real problems) why solar PV and wind turbines, with help from hydro and batteries and a few gas backup plants, cannot power the global electricity grid, as well as many other human activities (mining, transportation, manufacturing, agriculture, even heating, aviation, shipping). In the process, a lot of energy now wasted on fossil fuel extraction, transportation and distribution will be saved. And of course, a lot of the damage from uncontrolled AGW will be mitigated.
However, there are many actual reasons why these solutions are not enough. Humanity has overshot the carrying capacity of the planet, with AGW just one of resulting issues. To save much of the damage and prevent a civilizational collapse within a few decades, a convergence into the carrying capacity must occur quickly. Due to inertia in the energy system, lack of political will, the power of fossil fuel interests and entities, and the successful propaganda of climate change denial (and renewables denial as exemplified upthread) that has brainwashed the minds of many common people, renewables are being deployed much too slowly to solve the carrying capacity issue all on their own. The inability of humans to grasp slow-moving enormous and remote problems makes everything worse and reduces the chances of this being turned around.
A quick solution would be identified by complete halt of fossil fuel investments, a massive buildup of renewable generation, closure of fossil fuel generation as soon as enough renewable production goes online, deployment of transmission and grid storage on a proactive and accelerated basis, switchover of transportation and agricultural machines and mining equipment to electricity, conversion of industrial processes to electricity, and many more activities. This is not happening - renewables only solve some of the growth in the electricity sector. Rate of deployment should have been at least 10 times higher, sustained and growing over the next 20 years, in order to offer an acceptably quick solution. In 10 years, the whole electricity production system should be renewable, with all fossil fuel plants closed down except for some quick backup. In 20 years, all transportation and machinery should be electric. This is physically doable, but is not being done and will not be done in time.
Because of the above, consumption must be cut drastically, in order to enable a convergence of production consumption and natural limits before collapse. This includes overconsumption of food (especially meat), long rang commuting, conventions, faraway tourism, over-large houses, non-useful toys and frivolities and gadgets, and numerous other consumption avenues. This is not happening as well, for many of the actual reasons listed above, and because of human nature and the desire by most to have a more convenient and varied life and to imitate the highest lifestyle seen on TV and social media. The problem is exacerbated by continued population growth, and by the (blessed and justified) rise in affluence of poor populations around the globe. In order to converge into the limits in time, the developed world should cut its own excess consumption even more drastically, striving towards an equitable and rather low affluence level that can be applied globally, and the developing world should reduce its above-replacement birth rates now. None of this is happening in a rate commensurate with the timeframes and the problem at hand.
To sum, the Renewable Transition is possible and should be vastly accelerated and helped in parallel by reductions in consumption. Otherwise (which I expect) human civilization will pay the ultimate price for not acting in time.