re: 150 billion buys a lot of hot air
It's a non-sequitur that we can quantify just how much humans are contributing. My guess is a minor yet non-negligable amount. That answer we do NOT know, despite many who claim otherwise.
Let's all agree that the times they are a changin and we as a global species ought to do something about it.
Reminds me about when I 1st bought my place on the Cape Cod oceanfront, the two year old oven rusted out less than 2 years later. I asked the condo developer what to do about it. "Move inland", he said.