The only solution is for developed countries to greatly decrease their levels of consumption.The author is wrong. He apparently has bought into the TINA delusion. The only real cure that has a chance is to change the system.
The ruling class of capitalists cannot pursue the policies he outlines without interfering with their access to profits. This is like warning a hard-core heroin addict to give up the drug or it will kill him/her. Without extensive treatment they often end up killing themselves. In this case, they will take us with them.