London, March 24 : A new report has indicated that the greenhouse gas emissions of large cities are far below those of rural areas, which means city dwellers harm climate less.

According to a report in New Scientist, David Dodman at the International Institute for Environment and Development in London, who led the study, said previous claims that cities contribute disproportionately to global climate change are unfounded.

Washington, mar 24 : Seeing a huge restaurant menu usually makes us choose an old favourite instead of trying something new. Now, scientists have claimed that, when overloaded with information, other animals too display such behaviour.

Researchers from University of Leeds used computer modelling to examine the evolution of specialisation, and have shed light on why some animal species have evolved to eat one particular type of food.

Washington, March 24: Researchers have reported that gas hydrates, known as “ice that burns”, which is derived from chunks of ice that workers collect from beneath the ocean floor, show increasing promise as an abundant, untapped source of clean, sustainable energy for the future.

These so-called “gas hydrates,” a frozen form of natural gas that bursts into flames at the touch of a match, may one day may fuel cars, heat homes, and power factories.

Washington, March 24: An international team of researchers has found the earliest physical evidence for domesticated maize in Mexico, dating back to at least 8,700 calendar years ago, which is 1,500 years earlier than previously documented.

According to the researchers, the maize was probably domesticated by indigenous peoples in the lowland areas of southwestern Mexico, not the highland areas.

Washington, March 24: Researchers have gathered evidence of early human experiments with agriculture in dog and pig bones, as well as bones of other animals, from an archaeological site in a region of northwest China.

The bones come from a Neolithic site known as Dadiwan, in China’s western Loess Plateau, excavated first by a Chinese team in the late 70s and early 80s, and in 2006 by a team from the University of California, Davis, and Lanzhou University in China.

Washington  - Two Discovery space shuttle astronauts began their third spacewalk Monday to complete maintenance work on the International Space Station.

During the planned six-and-a-half hour spacewalk, astronauts Joseph Acaba and Richard Arnold were to reposition an equipment cart, complete the deployment of an external cargo mounting mechanism, lubricate the space station's robotic arm and reconfigure some cables that power the station's gyroscopes.

This is the second spacewalk for both Acaba and Arnold and the final one of the current mission.