During the massive investment associated with the Kyoto treaty, the participating countries’ investment in R&D as a percentage of GDP has declined , not increased. It is rather obvious that if you invest massively in inefficient solar panels, most of your money will go to buy the physical panels, whereas only a very small part will go to R&D. If you want more R&D, you should spend your money directly on R&D. This could tackle global warming in the longer run.