Mathematics Community Environmental Initiatives
The US Joint Math Meetings will have a number of environment-related talks, mostly on climate change. See this “State of the Planet” page for more information. For links to sites about incorporating environment into mathematics courses, go here. One of the listed sites contains a number of sustainability-related real data sets in spreadsheet form.
Lastly, the Mathematical Association of America (MAA) has an environmental mathematics special interest group. Its main activities seem to be around the math meetings.