Make no mistake, climate change is an existential threat to us all. This short introduction is aimed at anyone who wants to better understand what is happening. What is causing global warming? What will happen if we carry on with business as usual? What are the alternatives to fossil fuels and what changes do we need to make to our lifestyles to stop and reverse the warming?I am not a climate expert, merely an ordinary member of the public who happens to take an interest in this subject.more so in recent years since becoming a grandfather. I have written this short book to help other ordinary people get to grips with this important issue of our time and hopefully take action to create a more sustainable climate for the future.