The planet will be fine. It might suck for humans for a while (especially bad for poor people), but we will succeed in bringing carbon levels back to whatever is best for us (somewhere between pre-industrial and a hundred years ago, I suppose)
Right now the cheapest electricity is renewable. We are making inroads into electrifying transport and running planes and ships on renewable energy. There is money being pumped into research to find low carbon ways of making steel and concrete.
Once electricity is clean and transport is clean we're a long way towards cleaning up industry. Electricity, transport, and industry are the two biggest wedges in the emissions pie chart
There are clear paths to make agriculture cleaner through renewable fertilisers and treatments for ruminants' methane emissions (which oxidises the methane to CO2 (which is carbon neutral unless their feed was fertilised with fossil carbon))