For the past two years, at the invitation of the Argentine and Japanese G20 presidencies, UNDP and WRI have together advised the G20 Climate and Sustainability Working Group on the key role that long-term strategies and NDCs are playing to advance the G20 agenda and address climate change. This paper serves as an input document to the working group. It makes the case for why climate action is connected to G20 economic growth and shows how Long-Term Strategies (LTSs) and Nationally-Determined Contributions (NDCs) under the Paris Agreement work together to help countries meet their climate goals.