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We examine the evidence for the possibility that 21st-century climate change may cause a large-scale “dieback” or degradation of… Expand Increasing energy use, climate change, and carbon dioxide (CO2) emissions from fossil fuels make switching to low-carbon fuels a… Expand Recent climatic changes have enhanced plant growth in northern mid-latitudes and high latitudes. However, a comprehensive… Expand Forest fires are growing in size and frequency across the tropics. Continually eroding fragmented forest edges, they are… Expand The extraordinary abundance of ants in tropical rainforest canopies has led to speculation that numerous arboreal ant taxa feed… Expand For the past three centuries, the effects of humans on the global environment have escalated. Because of these anthro-pogenic… Expand Nearly half the world's vascular plant species and one-third of terrestrial vertebrates are endemic to 25 "hotspots" of… Expand Epidermal changes caused by a chytridiomycete fungus (Chytridiomycota; Chytridiales) were found in sick and dead adult anurans… Expand Numerical assessments of global air quality and potential changes in atmospheric chemical constituents require estimates of the… Expand The commonly observed high diversity of trees in tropical rain forests and corals on tropical reefs is a nonequilibrium state… Expand