While the U.S. has been fixated on President Trump’s contentious border wall project, another more ominous threat facing Guatemalans is building internally. In a swift reversal, many politicians and scholars who have previously argued for directing increased U.S. aid to communities in Central America’s Northern Triangle—Guatemala, El Salvador, and Honduras—as a humanitarian alternative to the border wall, are now calling on Congress to suspend some forms of aid to Guatemala, which they now see as the more humane option.

Starting in 2014, the number of migrants from Central America’s Northern Triangle—Guatemala, El Salvador, and Honduras—surged, with border apprehensions increasing fivefold from 2010-2015. While apprehensions have declined from their peak, emigration from these countries has not necessarily slowed, and the conditions the migrants are seeking to escape have not changed. Experts blame the region’s widespread criminal violence for spurring migration. But the Northern Triangle countries also share similar ecology, staple crops, and vulnerability to climate events. While environmental and natural resource factors are just part of the complex picture, understanding how they intersect with other migration drivers is key to creating and implementing effective policy responses.