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The first ever ‘red alert’ day in Beijing: reducing air pollution is one of the primary reasons for government action on climate change. Reuters

Why China and the US have found common purpose on climate change

The US-China relationship is crucial to any global deal on climate change. How strong is their common commitment to working on climate change, and can it last?
People queue up outside the US Supreme Court in Washington, DC to hear the case of Fisher v University of Texas, Austin. Jose Luis Magaua/Reuters

How much diversity can the US Constitution stand?

As the affirmative action case comes up before the US Supreme Court again, the question being asked is how much diversity is enough?
Metro Shooting Supplies employee Chris Cox speaks to a customer about the purchase of a 9mm handgun in Bridgeton, Missouri, November 13 2014. Jim Young/Reuters

Do gun purchases go up after mass shootings?

Research on background checks for gun purchases suggests there is an increase in gun acquisition a few months after a mass shooting happens.
The conflict mineral provision has hurt the victims of the violence more than the perpetrators. Reuters

Wall Street watchdog SEC can’t end violence in Congo

Congress tasked the SEC with reducing violence in Congo through Dodd-Frank’s conflict minerals provision. A laudable goal, but the SEC can’t achieve it.
The French flag flies over flowers, candles and messages in tribute to victims outside the Le Carillon restaurant a week after a series of deadly attacks in Paris, France last November. Charles Platiau/Reuters

When fear is a weapon: how terror attacks influence mental health

It is probably not a surprise that a terror attack can have a major impact on people’s mental health. But what sort of effects are common, and how long do they last?
Volcanoes produce large amounts of a gas that interacts with air to produce sulfate aerosols, which act as tiny mirrors in the atmosphere to reflect sunlight – and heat. NASA

Can solar geoengineering be part of responsible climate policy?

Blocking the sun by injecting tiny particles in the atmosphere – called solar geoengineering – can lower the Earth’s temperature but has some real costs. Economists run the numbers.