The article discusses how scientists create climate change scenarios for different regions. They use computer models to simulate how the climate might change in the future. These models show that there are challenges in predicting future climate changes accurately. One problem is that different models use different greenhouse gas scenarios. Another issue is that it's hard to link future climate projections to specific years. Also, the models sometimes show a drift in the climate that affects the accuracy of the predictions. To address these challenges, researchers are working on creating regional climate change scenarios that combine different modeling approaches.