First things first. In this post I will have a look at the basic structural requirements of a wind turbine blade, along with the most important material properties one has to keep in mind when selecting blade materials. (more…)
For a third year in row, California is suffering severe droughts. As a consequence, the water level of Lake Oroville has decreased towards historic lows. This also leads to a significant decrease of available hydropower and California is forced to rely more on natural gas plants, resulting in more CO2 emissions.
This set of pictures shows the fallback in nitrogen dioxide (NO2) between 2005 and 2011. NO2 is a yellow-brown gas that is often used as an indicator for air pollution in general. It is produced during the combustion of fossil fuels in vehicle engines and coal power plants. Thanks to new regulation, air pollution in the US has decreased significantly. These images represent the improvement seen in the northeast corridor of the U.S., from Boston to Richmond, where some of the largest absolute changes in NO2 have occurred.
Today the consumption of soy beans is ten times the amount of fifty years ago. Three quarters is used for the meat industry. The soaring demand for meat is putting high pressure on our planet as valuable agriculture land and ancient forests make way to grow food for animals instead of people.