Large urban agglomerations inevitably lead to air pollution. But despite the significant impacts on human health and climate, we lack systematic measurements of air pollution in many cities. Megan L Melamed, Tong Zhu and Liisa Jalkanen discuss a new global assessment that illuminates the knowns and unknowns.
Rising sea levels will eventually threaten many coastal cities. But a dominant focus on the long-term endgame should not unduly restrict our options to deal with the more immediate consequences of climate change, says Richard Little .
Planetary and Societal Risks: why we need planetary stewardship, 8 March 2011, United Nations, New York. Presentation by Professor Sybil Seitzinger, Executive Director, International Geosphere-Biosphere Progamme.
Professor Sybil Seitzinger 8 March 2011 United Nations New York
This issue’s cover story puts 2000 years of regional temperature histories into perspective. Also featured: two full-spread maps visualising the PAGES 2k regional temperature records and ocean acidifi...