If you believe that cleantech is just a fad, you should read this : ” Private investors are putting almost $1 trillion annually into green businesses and technologies, bringing the total invested worldwide since 2007 to $3.6 trillion ”
‘ (…) Ethical Markets expects the $1 trillion annual pace of investments to continue into 2020. Germany, Japan and the US lead in private green investments and China, Brazil and India lead among emerging nations. ”
Given the current general lack of commitment towards mitigating the brunt of climate change one can be sure that these investments will only increase as temperatures increase.