They must also be constructed so that the right amount of sunlight hits them — too much or too little slows growth. (scientificamerican.com)
One 1999 study showed that students in classrooms with a large amount of sunlight scored as much as 18 percent higher on tests, compared with students exposed to a low - light environment. (treehugger.com)
In order to offset the temperature change from a doubling of CO2 emissions, you only have to reflect a small amount of sunlight away from the earth — one or two percent. (grist.org)