We are not even at a place where we have seriously tried the low hanging options, like a major serious worldwide effort at building better energy technologies

We are not even at a place where we have seriously tried the low hanging options, like a major serious worldwide effort at building better energy technologies(there has been a lot of great work, but not great relative to what we can do), reducing tariffs on solar, giving cheap access to green technologies to poorer countries, or researching and publicizing mitigating steps which can reduce damage when natural disasters occur. Also, there are plenty of costs for the default option which should be included in the analysis. These are severe especially for low lying countries with a big coastline. But even for other countries, public health suffers due to burning fossil fuels, and political instability in oil rich countries has a big effect on the world.