Jay Inslee, the governor of Washington state, has said climate change is the “driving motivation” for his presidential campaign; some of his opponents agree, particularly after an April CNN/SSRS poll found that 82 percent of Democrats and Democratic-leaning voters described the issue as “very important.” One of these candidates will face off in the general election against a president who ran on the assurance that “I believe in clean air. Immaculate air.

In high-income countries like the U.S., the standard of care for people infected by HIV is to provide antiretroviral pills when the virus is found, even when there are no symptoms of AIDS. The strategy staves off the disease and has a second – big – benefit. It's been shown to prevent the spread of HIV in sexual encounters. It's called "treatment as prevention" (TasP in medical jargon), or "test and treat."

But in low-income countries, "test and treat" is not the typical approach to prevention. There's been no research to support it.

The global health community needs the humility to acknowledge that we have failed once again in an Ebola epidemic, say Karin Huster and Justin Healy

Fast Company - We know that rising carbon dioxide levels in the atmosphere are raising global temperatures and creating unstable and extreme weather patterns that will continue to threaten communities across the globe.