Taboos about mating across race, but we break them. We share the techniques of getting food. Cyclids have to evolve, can't share knowledge. Technology is the primary type of generosity. Bushmen live sparsely, fire became their friend.
Eucalyptus trees have deep roots, can live through fires.
White man changed environment. Shakespeare referenced birds, thought New York should be home for the all varieties of bird 1890 released starlings into Central Park 1942 to California Descend on potato fields. Causes plane crashes. Have tried everything, can't get rid of them. Our actions are irreversible.