Romano Prodi

We see evidence that lakes and forests and wetlands can have different equilibria - so you have a savanna system that may be stable and thriving, but it can also tip over and become an arid steppe if pushed too far by warming, land degradation, and biodiversity loss.

While the agreement provides a level of constraint on Iran's nuclear weapons program, it confers legitimacy on their nuclear threshold status, an unprecedented shift for a country with so many entanglements.