Skip Hobbs, geologist: The Future of Planet Earth: A Changing Biosphere, Humans, and Global Stewardship. Since its creation 4.5 billion years ago, the earth has experienced constant change. Geologic change takes time. Human civilization has made, and continues to make, profound changes to the earth, both to the benefit and detriment of mankind and all other inhabitants of earth's biosphere.
Albert Einstein is one of the most widely publicly recognized scientists ever. His humor in statements and photos as well as wonderful quotes about life are nearly equally well known.
Ben Johnson, Historic UK: By the late 1800s, large cities all around the world were “drowning in horse manure”. In order for these cities to function, they were dependent on thousands of horses for the transport of both people and goods. The manure on London’s streets also attracted huge numbers of ﬂies which then spread typhoid fever and other diseases. Similar issues of waste from low energy density energy sources like wind and solar apply, without the stench and disease spreading flies.