By comparing “first wave” developing countries, like Sweden and the United States, to “second wave” developers, like South Korea and Japan, Thomas Anderson and Hans-Peter Kohler of the University of Pennsylvania seek to explain why countries that underwent socioeconomic development in the first half of the 20th century have slightly higher fertility levels than those that developed later. Despite “both sets of countries attaining high income and generally low fertility, contemporary gender norms and levels of gender equity differ between them,” write Anderson and Kohler in a new study in Population and Development Review.

The announcement in Washington on September 24 that President Xi Jinping is committing China to a national carbon trading system is the latest step in an important partnership between the two biggest carbon emitters in the world.

As Pope Francis gets into high gear on his visit to the United States, it’s worth reviewing details and contexts in the extraordinary message to Catholics and the rest of the planet in “On Care for Our Common Home,” the encyclical he issued earlier this year.

As the world prepares for a pivotal climate conference in Paris this December, countries are offering their national plans to tackle a changing climate. These plans, known as intended nationally determined contributions (INDCs), contain details of what each country is prepared to do as part of a new global climate agreement. While the public focus is often on mitigation – how much countries are willing to reduce emissions, by when, and with what degree of transparency – adaptation to the impacts of climate change demands the same level of attention. In fact, the last round of international climate talks in Lima invited parties to include adaptation in their INDCs.

The World Economic Forum recently named water crisis the world’s number one risk for the next 10 years for its potential impact on people and industry. Indeed, as the global community grapples with climate change – and environmental change of all kinds – understanding the fundamental nature if water to human society is crucial. The input report for this year’s World Water Week, released yesterday by the Stockholm International Water Institute, in fact argues that getting water management right is a prerequisite for sustainable development.

President Obama’s recently announced Clean Power Plan – potentially a major turning point in the fight to contain greenhouse gas emissions and stop the slide toward an ever-warming Earth – is oddly both a courageous step in the right direction and codification of a process already underway.

REDD+, a global framework designed to reward governments for preserving forests, has pledged nearly $10 billion to developing countries. But minorities, indigenous people, the poor, and other marginalized groups that live in forest areas often end up paying more than their fair share of the costs of environmental cleanup and conservation while getting less in return. What can be done to change this?