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It's New Year's Day, 2101. Somehow, humanity survived the worst of global warming—the higher temperatures and sea levels and the more intense droughts and storms—and succeeded in stabilizing the Earth's climate. Greenhouse gas concentrations are peaking and are expected to drift downward in the 22nd century. The rise in global temperatures is slowing and the natural world is gradually healing. The social contract largely held. And humanity as a whole is better fed, healthier, and more prosperous today than it was a century ago. This scenario of an imagined future raises a key question: What must we do in the 21st century to make such a future possible, and to head off the kind of climate catastrophe that many scientists now see as likely? This question inspires the theme of the Worldwatch Institute's State of the World 2009 report: how climate change will play out over the coming century, and what steps we most urgently need to take now.

This updated and revised new edition of Assessing Climate Change deals with the full gamut of essential questions in relation to global warming and climate change, uniquely providing a balanced and impartial discussion of this controversial subject. It shows that most of what is “known”about the Sun, historical climates and projections for the future lacks foundation and leaves great room for doubt.Assessing Climate Change (3rd Edition) examines the credibility of the global climate models which accuse greenhouse gases of causing the temperature rise of the 20th century, and provides a better understanding of the uncertainties regarding what might lie ahead in the future. Carefully considering the “evidence” brought forward by both alarmists and skeptics, this book:• has been brought completely up to date to end 2013;• examines the measurements of near surface temperatureson Earth and how much we can rely on them;• includes hundreds of graphs showing the data;• compares the current global warming trend with past climate fluctuations;• provides a systematic review of climate change in nearly all of its aspects;• expands the discussion of potential impacts of global warming (from whatever cause);• includes nearly 1000 references specific to the climate literature.

This meticulously documented call-to-action reveals extensive scientific evidence that the global warming crisis is far worse than officially indicated — and that we're almost at the point of no return. Serious climate-change impacts are already happening: large ice-sheets are disintegrating, sea-level rises will reach 5 metres this century, and we are seeing devastating species loss. It is no longer a case of how much more we can ‘safely'emit, but whether we can stop emissions and produce a deliberate cooling before the Earth's climate system reaches a point beyond any hope of human restoration. These imperatives are incompatible with ‘politics as usual'and ‘business as usual'— we face a sustainability emergency that urgently requires a clear break from the politics of failure-inducing compromise.

How members of college and university communities can take action on climate change: strategies, projects, and lessons in how to motivate complex organizations to make changes.Universities and colleges are in a unique position to take a leadership role on global warming. As communities, they can strategize and organize effective action. As laboratories for learning and centers of research, they can reduce their own emissions of greenhouse gases, educate students about global warming, and direct scholarly attention to issues related to climate change and energy. Degrees That Matter offers practical guidance for those who want to harness the power of universities and other institutions, and provides perspectives on how to motivate change and inspire action within complex organizations.The authors, drawing on almost a decade of experience leading the Tufts Climate Initiative and other institutional'greening'efforts, provide both the basic facts and more detailed information about climate issues. Some chapters can be used as stand-alone action guides for specific areas, while others put climate action in scientific, economic, and political contexts. The authors discuss the major sources of greenhouse gas emissions on campus and the importance of an emissions inventory for setting goals and strategies. They consider decision making (and decision makers), costs, budgets, and institutional priorities, and describe different emission reduction projects. They look at the importance of master planning for the university and the value of action by individual community members. Finally, they suggest climate action projects for the classroom and offer guidance for tapping student energy. Their aim is to inspire others to take on global warming regardless of organizational setting.