This key sheet introduces a series aimed at DFID staff and development partners on the impact of climate change on poverty, focusing on vulnerability, health and pro-poor growth.This key sheet aims to guide the reader through the issues of:Defining climate changeIts impact on developing countriesIts impact on poverty, pro-poor growth, livelihood assets and vulnerabilityResponding to climate change.It introduces mainstreaming in policies and processes as the best way to respond to the challenge of climate variability and change. [adapted from author]