Getting to net zero--and even net negative--is surprisingly feasible, and affordable

[NNadir]

6. In this century, already, we have spent over 2.7 trillion dollars on solar and wind energy.

The amount of money "invested" in so called "renewable energy" in the period between 2004 and 2018 is over 3.036 trillion dollars; dominated by solar and wind which soaked up 2.774 trillion dollars.
Source: UNEP/Bloomberg Global Investment in Renewable Energy, 2019

The result has been that yearly increases in carbon dioxide concentrations on this planet measured at Mauna Load has reached 2.4 ppm year, having increased since the last week of 2004 when it was 377.9 ppm to yesterday, when it was 415.46 ppm. (Accessed 01/28/21)

Perhaps you have heard that cliché about doing the same thing over and over and over and expecting a different result being defined as insanity.

I have.