Not too much money, honestly. It’s like this… if you have a 3,000 square foot house but only 100 square feet are updated but the rest is filthy… the house is still ugly and unlivable. Until a firm commitment from massive polluters like the nations of Central America, China, India, SE Asia, etc can get on board, it’s a waste of money. I would mainly put funds into research for when the world is ready. A complete overhaul of America’s energy system would redirect funds away from important and pressing matters… education, infrastructure, military, etc. It could literally bankrupt us if we got carried away. All of that for reducing only a couple percentages of the worlds pollution. So, yes within reason until the world is ready to work together on it.