For a quick primer - about 20 pages - with a lot of statistical evidence, try this White Paper on The State of the Planet. This is an assemblage of third-party info suitable for informing skeptical relatives or as a starting point for research on issues around global climate change. It's also available for free reprint or republication.
In another section of the website there are shorter briefings on sustainable living - one that's interesting if you have college students interested in going green is the one on the history and role of the campus greening movement in the growth of current day environmentalists. That section is at http://livegreenlivesmart.org/library/articles/default.aspx
They are best on green housing, but the briefings are nice succinct pieces sure to be swiped by community newspapers, newsletters, and high school students in need of a few fast pages....