Paul Raskin et al., Great Transition: The Promise and Lure of the Times Ahead (Boston: Stockholm Environment Institute, 2003) Ashort but deeply thought through assessment of the possible future scenarios facing humanity.
Al Gore, The Future: Six Drivers of Global Change (New York: Random House, 2013). Athorough and discerning evaluation of the major drivers for change in our global society, and their implications for the future.
Joseph A. Tainter, The Collapse of Complex Societies(Cambridge: Cambridge University Press, 1988). A scholarly analysis of societal collapse that has deservedly framed much serious discussion on the topic since its publication.
Jorgen Randers, 2052: A Global Forecast for the Next Forty Years (White River Junction, VT: Chelsea Green, 2012). A thoughtful projection into the future by one of the original team members of Limits to Growth.
Thomas Berry, The Great Work: Our Way Into the Future (New York: Three Rivers Press, 1999). A penetrating and visionary account of the enormity of the challenge and opportunity facing humanity in the future.