The Eastern Hemlock, massive and majestic, has played a unique role in structuring northeastern forest environments, from Nova Scotia to Wisconsin and through the Appalachian Mountains to North Carolina, Tennessee, and Alabama. A "foundation species" influencing all the species in the ecosystem surrounding it, this iconic North American tree has long inspired poets and artists as well as naturalists and scientists. Five thousand years ago, the hemlock collapsed as a result of abrupt global climate change. Now this iconic tree faces extinction once again because of an invasive insect, the hemlock woolly adelgid. Drawing from a century of studies at Harvard University's Harvard Forest, one of the most well-regarded long-term ecological research programs in North America, the authors explore what hemlock's modern decline can tell us about the challenges facing nature and society in an era of habitat changes and fragmentation, as well as global change.

A straightforward and fact-based exploration of how weather happens, how it relates to climate, and how science answers major questions about Earth as a system   Climate change is one of the most hotly contested environmental topics of our day. To answer criticisms and synthesize available information, scientists have been driven to devise increasingly complex models of the climate system. This book conveys that the basics of climate and climate change have been known for decades, and that relatively simple descriptions can capture the major features of the climate system and help the general public understand what controls climate and weather, and how both might be changing.   Renowned environmental scientist and educator John D. Aber distills what he has learned from a long fascination with weather and climate, the process of science, and the telling of the story of science. This is not a book about policies and politics. Instead, it explores how weather happens, how it relates to climate, and how science has been used to answer major questions about the Earth as a system and inform policies that have reversed environmental degradation. By providing a guided tour of the science of weather, this thoughtful survey will contribute clarity and rationality to the public understanding of climate change.

This book explores the ecological concepts and ideas involved in the practice of habitat restoration by taking a theoretical approach that will appeal to ecologists concerned with the structure and dynamics of communities. The contributors examine aspects of this new realization and its implications for both ecology and the practice of habitat restoration. What emerges is the outline of a new paradigm for ecological research and the basis for a stronger relationship between theory and practice in this area.