"From year to year, environmental changes are incremental and often barely register in our lives, but from evolutionary or geological perspectives, what is happening is explosive change."

"The medical literature tells us that the most effective ways to reduce the risk of heart disease, cancer, stroke, diabetes, Alzheimer's, and many more problems are through healthy diet and exercise. Our bodies have evolved to move, yet we now use the energy in oil instead of muscles to do our work."

"The damage that climate change is causing and that will get worse if we fail to act goes beyond the hundreds of thousands of lives, homes and businesses lost, ecosystems destroyed, species driven to extinction, infrastructure smashed and people inconvenienced."

"Doing all we can to combat climate change comes with numerous benefits, from reducing pollution and associated health care costs to strengthening and diversifying the economy by shifting to renewable energy, among other measures."

"History passes the final judgment."

"Developments in information technology and globalised media mean that the most powerful military in the history of the world can lose a war, not on the battlefield of dust and blood, but on the battlefield of world opinion."

"Perhaps, to the uninformed, it may appear unaccountable that a man should be able to retain in his memory such a variety of learning but the close alliance with each other, of the different branches of science, will explain the difficulty."

"You had to be aware that I saw that photography was a mere episode in the history of the optical projection and when the chemicals ended, meaning the picture was fixed by chemicals, we were in a new era."