It is widely recognised that climate change is one of the most important problems of our time. This course will first cover the basic physical science related to different components of the earth system that are related to various aspects of weather and climate. These concepts are then applied to explain the science of climate change. The tools in studying the past and current weather and climate as well as in weather and prediction and in future climate projection will also be introduced. The second part of the course is to make use of the knowledge from the first part on the science of climate change to understand different types of extreme weather and their impacts on society, and to discuss various adaptation measures to tackle these impacts. The last part will be on mitigation strategies to slow down anthropogenic climate change.