If you’re already doing your part to reduce, reuse and recycle, what more can you do? Start by thinking bigger, but not too big — one community at a time.

The shift to renewable energy is key to combating climate change and reducing our dependence on fossil fuels. But critics argue it won’t be possible without financial support from the government. How important are special tax breaks and other subsides, and do they really work?

Puerto Rico suffered an estimated $94 billion or more in damage, on top of an already sagging economy and $74 billion in debt. The island needs a total reboot. Can it do it sustainably?

Hannah Nissan, a postdoctoral research scientist at the International Research Institute for Climate and Society, studies how better climate forecasting might help reduce the number of deaths from heat waves and improve agriculture and child nutrition.

The onset of flu season each year comes as no surprise. But what is surprising is that we don’t know exactly how the flu spreads. Jeffrey Shaman is working on that.

Christine McCarthy, a geophysicist at the Lamont-Doherty Earth Observatory, scrunches blocks of ice between hunks of rock to study how ice behaves under pressure. Her work provides an important piece of the puzzle of how glaciers move, what makes them speed up, and how they are contributing to sea level rise as the climate warms.

Superstorm Sandy was a wake-up call for a lot of people in New York City, including Adam Sobel, who’s spent more than two decades studying the physics of weather and climate.

California’s wet and snowy winter brings welcome relief from a years-long drought that has challenged the state’s water supply and agricultural system. But climate scientist Richard Seager of Lamont Doherty Earth Observatory offers words of caution: Remember what happened, because it will happen again.

Leymah Gbowee was 17 when war broke out in Liberia. Her experiences drove her onto a path of suffering, discovery and service that led to work rehabilitating child soldiers and helping build peace, village by village, in Liberia and eventually neighboring Sierra Leone.

Michelle Ho grew up in Australia, the driest inhabited continent, with an appreciation for the value of having a clean glass of water to drink. Now, she conducts research for the Columbia Water Center on America’s water systems.