Smart Takes  Could putting sunscreen in the sky combat warming?
Posting in Environment  Scientists want to spray titanium
dioxide into the stratosphere to counteract the effects of
global warming.  Scientists are looking to the protective power
of sunscreen to combat global warming.  Chemical engineer Peter
Davidson is championing an idea to spray titanium dioxide, an
ingredient in sunscreen, into the sky to reflect some of the
sun’s rays back into space to cool Earth.  The plan is to carry
the nontoxic chemical up to the stratosphere in high-altitude
balloons and then spray the particles into the stratosphere.
National Geographic News reports:  "About three million tons of
titanium dioxide—spread into a layer around a millionth of a
millimeter thick—would be enough to offset the warming effects
caused by a doubling of today's atmospheric carbon dioxide
levels, according to project leader and chemical engineer Peter
Davidson."  This is just another in a series of geoengineering
projects scientists have come