Fickle weather patterns due to climate change and a global demand that outstrips supply have put one-fourth of the Earth’s population in areas of “extremely high” water stress. We found 122 equity funds that invest in companies providing a solution to the water crisis but far fewer are “pure” water plays.

When it comes to reducing greenhouse gases, investors tend to focus on fossil fuels and power generation. But other companies also need to adapt to a lower-carbon world. We look at the implications for five types of companies.