For the past ~60 years... with maybe just a bit of slack on the start of that, it would include tremendously impactful things like: - the clean air act and clean water act - endangered species act and restrictions on international trade for protected animals and plants - creation of the EPA, and reductions and regulation of pesticides and herbicides - the emergence of the organic food industry - the Montreal protocol and global reduction in CFC production - contribution to the development of clean energy technology -- you could argue that now the boom in clean energy is just economics in action but that comes after decades of basic science and technical innovation motivated by environmental concerns.