This feature article provides a summary of study about the role of clouds in the balance. Until recently, scientists were uncertain whether clouds had an overall net cooling or heating effect on the Earth's climate. But recent studies show that, in the tropics, a "near cancellation" between shortwave cooling and longwave warming exists, which indicates that the amount of incoming radiant energy is roughly equal to the amount of outgoing radiation. However, small changes in tropical cloudiness can disrupt this precarious balance.

What is the overall state of the Arctic environment? The aim of this report is to answer the many aspects of this seemingly straightforward question. Although several national and international efforts have looked at parts of the Arctic, this is the first attempt to assess the state of Arctic flora and fauna as a whole.

Scientific news article about Snowball Earth eras. These are times when ice periodically covered the globe, and the era called the Cambrian Explosion, which produced the first fossils of almost all major categories of animals living today.

Average temperature has risen 1 degree F over the last century in the Mid-Atlantic Region as well as across the globe. Climate science is developing rapidly and many studies project additional warming. Although the future is uncertain and difficult to predict, our best science suggests the following changes are likely. The Mid-Atlantic Region will be somewhat warmer and perhaps wetter, resulting in a wide range of impacts on plants, wildlife, and humans. Human activities that release heat-trapping gases into the atmosphere will continue to accelerate the observed warming trend. Climate change will compound existing stresses from population density and development. The region's overall economy is quite resilient, but impacts will be more severe for some economic activities and localities.

This press release summarizes the findings of a new study. Saharan dust clouds travel thousands of miles and fertilize the water off the West Florida coast with iron, which kicks off blooms of toxic algae. The research was partially funded by a NASA grant as part of ECOHAB: Florida (Ecology and Oceanography of Harmful Algal Blooms), a multi-disciplinary research project designed to study harmful algae.

This brief news article provides preliminary evidence that global warming may have sped up the pace at which grasslands are being overtaken by mesquite, creosote and other shrubs at desert sites around the world.

This Law was formulated in order to prevent desertification, to improve and reclaim desertified land, to protect the environment, and to promote a sustainable economy and society.

This document, which is produced annually, describes the activities and plans of the U.S. Global Change Research Program (USGCRP), which was established in 1989 and authorized by Congress in the Global Change Research Act of 1990. Strong bipartisan support for this inter-agency program has resulted in more than a decade's worth of scientific accomplishment. "Because there is considerable uncertainty in current understanding of how the climate system varies naturally and reacts to emissions of greenhouse gases and aerosols, current estimates of the magnitude of future warming should be regarded as tentative and subject to future adjustments (either upward or downward). Reducing the wide range of uncertainty inherent in current model predictions of global climate change will require major advances in understanding and modeling of both (1) the factors that determine atmospheric concentrations of greenhouse gases and aerosols, and (2) the so-called 'feedbacks' that determine the sensitivity of the climate system to a prescribed increase in greenhouse gases. There is also a pressing need for a global system designed for monitoring climate. Climate projections will always be far from perfect. Confidence limits and probabilistic information, with their basis, should always be considered as an integral part of the information that climate …

Different speakers addressed the Panel, and some highlighted the importance of sound data for monitoring and predicting the climate system and noted with concern the decline in observational networks. Others emphasized the value of the scientific information provided by the IPCC for the Convention process and highlighted the need to integrate scientific assessments in sustainable development consideration and to communicate with a wider audience.

Different speakers addressed the Panel. Among other issues, the Eighteenth Session of the IPCC decided that its work must continue to maintain its high scientific and technical standards, independence, transparency and geographic balance, to ensure a balanced reporting of viewpoints and to be policy relevant but not policy prescriptive or policy driven.

The degree to which carbon flows balance each other - human activities leading to carbon emissions into the atmosphere, vegetation and oceans soaking it up - is the subject of vigorous debate. It is not yet possible to define quantitatively the global effects of human activities such as forestry and agriculture, and may never be so. However, studies to determine these effects have emerged as critical for understanding how the earth's climate will evolve in the future. Global concern about the potential implications of the behaviour of the carbon cycle under anthropogenic stress includes concepts of system instability and large scale change. To contribute to understanding this behaviour, and our potential responses to it, requires a thorough investigation of both biophysical and social systems. Until recently, most scientific assessments of such risks focused on the anatomy of conceivable environmental changes themselves, devoting little attention to either the human driving forces or the ecosystems and societies that might be endangered by the changes. Recently, however, questions about the linkage and interaction of social, ecological, and biogeochemical systems are emerging as a central focus of policy-driven assessments of global environmental risks. The approach used here is to accept humans as an integral …

The State Council approved the National Tenth Five-Year Plan for Environmental Protection on 26 December 2001, requesting that loca1 governments and the various departments strengthen environmental protection in close relation with the economic restructuring; raise funds for environmental protection through multiple channels in connection with the expansion of domestic demand, and establish the mechanism of environmental protection with the government playing the dominant role with market promotion and public participation. The State Council emphasizes that local governments should undertake the major responsibilities of environmental protection. The governments at various levels should integrate the tasks of the Plan into the target responsibility system for provincial governors, mayors, and county heads. Periodic examination should be carried out on the targets of total pollutant discharge control and environmental quality. The implementation of the Plan should be inspected and reported on every year. The State Council requests that the relevant departments should provide guidance and support in implementing the Plan according to their respective responsibilities. The State Environmental Protection Administration should conduct coordinated supervision, management, and inspection of the implementation of the Plan.

This report discusses different perspectives used to consider issues related to the global climate change and issues related to the 1992 U.N. Framework Convention on Climate Change and the 1997 Kyoto Agreement.