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Dams And The Environment
There are an estimated 84,000 dams in the United States which impound 600,000 miles of river, or about 17% of the rivers in the country. Within the next 15 years, more than 90% of the world’s rivers will be fragmented by at least one dam.
Mapping Risk
The International Union for Conservation of Nature (IUCN) is the global authority for determining species’ vulnerability in the face of threats such as habitat loss and climate change. How widely a species can be found – its geographic range – is a key indicator used by the IUCN to assign an appropriate conservation status.
Hydrogen On Demand
Researchers at the Technion-Israel Institute of Technology have developed a new method for producing hydrogen from water using solar energy. If successfully developed, their approach would make it possible to produce hydrogen in a centralized manner at the point of sale such as at a fueling station for hydrogen-powered cars.
Did People Create The Sahara Desert?
One of the arguments some people make when discussing human causes of climate change is that people can’t cause such massive changes. However, there is a long historical record of human-driven ecological and climatic change in Europe, North America and New Zealand, among other places.
Climate Change And A Divided Country
This Saturday is Earth Day and it’s also the occasion for the March for Science taking place in Washington, DC and in many other cities around the world. The purpose is to express support for scientific research and evidence-based policies in a tumultuous political environment.
Cleaning Britain’s Air
According to a new study by the non-profit group Carbon Brief, carbon dioxide emissions in the United Kingdom are at their lowest levels since the 1920s. Four factors are responsible: a record drop in coal use, the rapid growth of renewable energy, the expansion of energy efficiency programs, and the increased use of natural gas for electricity power plants.
Climate-Friendly Refrigerants
In 1988, President Reagan signed the Montreal Protocol, which banned CFC refrigerants like Freon in air conditioners and refrigerators. The chlorofluorocarbons were the cause of a giant hole in the ozone layer, which has been shrinking ever since the ban. Unfortunately, the chemicals that replaced CFCs – hydrofluorocarbons or HFCs – have their own major problem: they are a seriously bad greenhouse gas, far worse than carbon dioxide. Last fall, an international agreement was reached by over 170 countries to reduce and eventually replace HFCs, which included 100 developing countries like China and India where air conditioning use is growing fastest.
Bleached And Dying
Climate change is posing a major threat to the future of coral reefs. According to a recent United Nations-backed study, if swift action is not taken to curb greenhouse gas emissions, annual coral bleaching events will affect nearly all of the world’s coral reefs. And coral bleaching can result in serious coral mortality – as Australia’s Great Barrier Reef has recently illustrated.
Global Climate Or Local Weather?
We don’t experience climate; we experience weather. And a new study has found that what Americans believe about the changing climate often depends more on their personal experience than what is going on around the world.
Widespread Local Extinctions
Plants and animals have evolved over time to live in specific environmental niches. As the climate warms, parts of the ranges in which they live may no longer offer the conditions under which they can thrive. Species can respond to these changes in three ways: they can adapt to new conditions by undergoing niche shifts; they can relocate to better conditions, such as by moving to higher elevations or latitudes; or they can locally go extinct.
Ecotourism And Endangered Species
Ecotourism is increasing on a global scale. Ecotourism is generally defined as responsible travel to natural areas that conserves the environment, sustains the well-being of the local people, and involves interpretation and education. Visitor numbers to many protected areas around the world are expanding every year. Ecotourism provides rich experiences for the traveler and often has great benefits to local communities fighting poverty and seeking sustainable development.
Counting Trees
