The title is misleading as the article doesn't really describe hedging. It gives examples of various individuals and groups who are placing increasing value on technologies and resources related to global warming. Their investments naturally reflect their assessments, which is actually a good thing. If global warming is happening, then price adjustments are needed to encourage conservation, the search for alternative…
The only thing that I can see the market re-pricing in regards to global warming is land, i.e. you could buy some land in Siberia now because it will be livable in the future. However, that future is so far away it doesn't make sense to buy in this lifetime. Furthermore you could be shorting any business that depends on a stable climate.