They accelerated in the spring, when UBS shut down its Dillon Read hedge fund after losses in subprime bonds, and really hit a tone of urgency in June, when Bear Stearns, one of the biggest arrangers of mortgage bonds on Wall Street (and presumably, thus, an expert) was forced to shut down two of its hedge funds because of overwhelming redemptions and margin calls.
He was instrumental in getting chlorofluorocarbon (CFC) refrigerant production banned because they accelerated the destruction of stratospheric ozone over and near Antarctica in early spring.