Harvard University researchers were given permission by the Swedish Space Corporation to carry out a test next year that may lead to releasing artificial particles into the air to partially block out the sun. This approach could potentially reduce global warming and cool our planet, but has raised geoengineering concerns among environmentalists. The opponents of the idea see pitfalls in climate engineering and artificial sunshade projects. There are too many risks and unpredictable domino effects. Environmental policy expert Lili Fuhr of the Heinrich Böll Foundation in Germany described the Harvard test as “crossing an important political red line” and thinks the small experiment will lead to larger and more dangerous ones…