http://www.newsweek.com/fact-check-bill-gates-block-sun-conspiracy-theory-scopex-1573108

Billionaire philanthropist and Microsoft co-founder Bill Gates is no stranger to conspiracy theories and speculation about the projects he funds.

One that has persisted in recent weeks involves an experiment by a team of scientists at Harvard University, known as the Stratospheric Controlled Perturbation Experiment (SCoPEx), that is testing aerosols that might be relevant to solar geoengineering.