Aregion experiences frequent landslides from heavy rains. how can the local residents lower the frequency of landslides in the region?

The best way to do that is by growing a large number of trees in that area. This is so because growing multiple trees in an area creates roots that anchor the soil into the ground. Hope this is useful 

He want to contact the red cross/red crescent because they are the main non profit organization that deals with disasters around the world