It would be ‘convenient’ to have a climate solution, where technological innovations fix the problem without any change to current institutions, structures, and lifestyles. However, even though we have some interesting options at lab scale, innovation must be scaled up to make a difference, and it is impossible between now and 2050 for the ‘convenient’ solution to be built at the necessary scale. In addition, there can be no physically meaningful offsets because trees take too long to grow and there are no realistic emissions-negating technologies. This book’s journey to zero emissions reduces technological risk to a minimum by assuming that only technologies that already exist at scale can help, and that they will be deployed only at rates comparable with recent history. This is not ‘convenient’ in that it involves some societal change and therefore we must find the courage to act. However, we can still have a high quality of life, and expand many of the activities we most value.