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Once largely confined to the sunny Southwest, utility-scale solar power plants are now being built everywhere from Minnesota to Alabama to Maine. Aided by plunging costs and improving technologies, these facilities are expected to provide a big boost to U.S. solar energy production.

Consider that the Earth is just a giant cosmic dust bunny—a big bundle of debris amassed from exploded stars. We Earthlings are essentially just little clumps of stardust, too, albeit with very complex chemistry.

And because outer space is a very dusty place, that makes things very difficult for astronomers and astrophysicists who are trying to peer farther across the universe or deep into the center of our own galaxy to learn more about their structure, formation and evolution.

As Toronto continues to grow, urban agriculture may play a more significant role for people seeking alternative sources of nutritious and affordable food, U of T researcher Colleen Hammelman says.  

Natural gas is meant to be a far lower carbon fuel than coal, writes Steve Horn. But a new study shows that methane leaks from gas power plants and oil refineries are 20-120 times higher than thought. And with methane a greenhouse gas almost 100 times stronger than CO2 over 20 years, the leaks are equivalent to about a tenth of the US's CO2 emissions.

Los datos muestran que las emisiones globales de CO2 han permanecido aproximadamente iguales por tercer año consecutivo. Aunque es una buena noticia para la lucha contra el cambio climático, es importante poner estos datos en perspectiva