I notice that Nature Reserves now deal -3 pollution per turn which is a nice way to deal the pollution mechanic. However, I built a ton of nature reserves and noticed that when I did my city and attached territories did not display the correct amount of pollution. The game's difficult made it so it canceled out my Nature Reserves effect (it became + pollution instead, when it should be - pollution), when it should be helping you. Plus, when I researched Fusion Reactor, it made me generate + pollution when it should be generating -50% pollution on territories. Also, I have not built any + pollution type buildings/projects, only - pollution type buildings/projects yet I have the highest pollution total.

One more thing, not sure if this is a bug or not but you can never seem to build Nature Reserves on River Spring titles.