> Build renewable generation to stop releasing GHGs

No. Because building renewable generation will produce more GHG's than you are going to "stop producing". Manufacturing isn't a clean process, particularly when you consider that most of the "build renewable generation" will more than likely happen in China, the worst possible locale in terms of GHG generation.

Reforestation is, without a doubt, important. However, a sense of scale is important here. You need somewhere over ONE TRILLION trees in order to counter the effects of ten years of CO2 emissions. This, BTW, assumes we plant trees everywhere possible on earth. The research comes from ETH Zurich.

I don't think you took the time to read the article I posted. This isn't some lightweight magazine conversation maker. This was written by people who came into the project KNOWING that renewable energy sources were the solution and wanted to show the world this to be the case. Instead they discovered they were wrong. If you think this has no merit I would suggest contacting the researchers to explain how you are right and they are wrong.

The hubris here is to pretend that we can magically change the rate of change of atmospheric CO2 reduction from a historical (800,000 years of data) rate of 100 ppm per 50,000 years to 100 ppm in 50 or even 100 years. That is preposterous at best.

The kind of energy and resources that would be necessary to achieve this rate of change acceleration as well as the waste product that massive undertaking would produce is far more likely to kill us all than "save the planet".

This does NOT mean we should not deploy clean energy or engage in aggressive reforestation. Not at all. What it means is that we need to stop lying about why we are doing it. We are not going to make even a dent on atmospheric CO2 accumulation through any of these means. Not possible.

Here's the question nobody ever wants to answer:

Without humanity on this planet (at our current scale) and all of our technology (power plants, transportation, etc.) it took the planet some 50,000 years to reduce CO2 by 100 ppm. We have highly accurate data on this going back 800,000 years.

Compare these two scenarios:

1- No humanity. No factories, power plants, planes, trains, automobiles, ships, deforestation, etc. Without ANY of that in place it took an average of 50,000 years to drop 100 ppm.

3- Humanity in full force. Factories, power plants, planes, trains, automobiles, ships, deforestation, etc. And all we do is switch to "clean" energy and do some reforestation (say, 25% of what was los). And THAT is going to change the rate of reduction from 50,000 years to 50 years for 100 ppm?

How?

In the one case we do not even exist. In the other we make token improvements to how clean we might be. How is that magically going to save the planet in 50 years, or 100, or even 1,000?

You see, it's fine to talk about generalizations: Renewable energy, reforestation, geoengineering. Good stuff. And yet nobody stops to explain how that stuff is going to, not only do better, but actually reverse the trend when compared to a scenario where the entirety of humanity does not exist on this planet.

It's like an alcoholic switching to three bottles per day to just two. Valiant effort, but pointless.

That is the inconvenient truth, isn't it?