| Land Cover Validation Platform (LACO-Wiki) |
| Landis MacKellar |
| LandSense: A Citizen Observatory and Innovation Marketplace for Land Use and Land Cover Monitoring |
| Landslide EVO Annual Meeting |
| Large Community-Evolution Models (LCEMs) |
| Launch of the 2020 Sustainable Development Goal 7 Energy Tracking Report and policy briefs |
| Launch of the Global Agro-Ecological Zoning platform version 4 (GAEZ v4) |
| Launch of the Northern African Applied Systems Analysis Centre |
| Laura Graham |
| Laura Warnecke |
| Laura Wienpahl |
| Laxenburg Environment and Climate Day 2021 |
| Laxenburg Environment and Climate Day 2022 |
| Learning from COVID-19 and upgrading sustainable governance |
| Lecture on climate change at the Indian National Defence College |
| Leena Ilmola-Sheppard |
| Leena Srivastava |
| Leila Niamir |
| Lena Höglund Isaksson |
| Leonarta Murselji |
| Leopold Ringwald |
| Let’s not be arrogant about climate change adaptation |
| Life at IIASA |
| Lifetime Achievement Award |
| Lifting COVID-19 restrictions: Visualizing real-time Twitter sentiments |
| Limiting climate risks for finance: Central banks and science publish scenarios |
| Limiting CO2 emissions is not enough, methane must also be reduced |
| Limiting global temperature increase to 1.5°C above pre-industrial levels |
| LIMITS Scenario Database (LIMITS) |
| Linda See |
| Lindsay Radakovits-Smith |
| Linking Climate and Development Policies – Leveraging International Networks and Knowledge Sharing (CD-LINKS) |
| List of Highly Cited Researchers 2020 announced |
| Live Panel Discussion on COP 26 |
| Ljubinka Torlakovic |
| Logo guidelines |
| Long-Term Joint European Union - African Union Research and Innovation Partnership on Renewable Energy (LEAP-RE) |
| Longevity heterogeneity and pension design |
| Lorraine Tembo |
| Loss and Damage |
| Love Ekenberg |
| Low Energy Demand study (LED) |
| Luca Guillaumot |
| Luis Gomez Echeverri |
| Luke Kirwan |
| Luzma Fabiola Nava |