“Women and men face very different risks and challenges,” said Chitra Nagarajan, a writer and journalist who covers climate change, conflict, and gender. She spoke in this week’s podcast about what’s changed in the Lake Chad region. In the last few years the combination of profound climate change and high levels of insecurity have made life harder for the local population. To get a sense of how recent changes have affected Lake Chad’s residents, Nagarajan interviewed more than 250 people. These are some of her findings.

As fires rage in Australia and in the Amazon, hurricanes ravage the Caribbean year after year, and glacial melt threatens entire communities in the high mountains of Asia and Europe, peace and climate activists might be forgiven for experiencing a growing sense of dread. Environmental events of this magnitude have the potential to simultaneously trigger new ecological disasters and strain social and political systems. The unprecedented challenges borne of the climate crisis will be far-reaching, from large-scale involuntary migration and food and water shortages, to biodiversity and ecosystem loss. These challenges require responses that build social cohesion rather than fuel conflict—responses that are collaborative, just, and climate-resilient.

The urgency to address climate change is only growing. As youth step up and are increasingly vocal about climate change, international negotiations—most recently at COP25—fail to deliver the ambitious global action required for effective response.

Where does this leave the communities most at risk from climate impacts? How can they adapt and transform in the face of enormous threats, sometimes to their very existence? With researchers and policy experts often focused on technological fixes and pushing new solutions to specific threats, it’s easy to assume that transformation is underway to respond to the new climate reality. In reality, transformative change is tough—especially when up against ingrained habit, culture, and a lack of political and financial resources to support it. Perhaps most importantly, transformative change requires effective leadership and champions—those people who build political will and create momentum to move policy innovations or on-the-ground action.

Climate change is widely recognized as a “threat multiplier.” From the United Nations to the G7 to the US Department of Defense, there is emerging consensus that climate change poses risks to both human and natural security through a variety of complex and interrelated channels. The extent of those risks, and how they connect to armed conflict, however, remain widely debated.

We face the greatest environmental challenges ever relating to climate change, biodiversity, land use, and more. Humans are driving 1 million species to extinction, according to a report by the UN-backed Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services. Some $44 trillion of annual global economic product that depend on nature are in jeopardy. Fires have ravaged large swathes of the Amazon—Brazil and Bolivia in particular—and Australia.

Humanitarian need is increasing. Crises are becoming more complex through the interactions between climate change, disasters, and conflicts. Not only are humanitarian crises on the rise, but the nature of crises is changing, largely due to climate change-driven extremes such as floods, droughts and typhoons. Over 90 percent of disasters are believed to be related to climate.