This document provides an overview of key topics in environmental science, including the nature of environmental science, natural resources, sustainability, and pressures on the global environment. It discusses how humans exist within and depend on the environment, and how environmental science studies these interactions. It also summarizes perspectives on population growth, the tragedy of the commons, ecological footprints, and the state of the world in terms of pollution, climate change, and biodiversity loss. Scientific principles and the importance of global, sustainable solutions are emphasized.

1. An Introduction to Environmental Science

25. However, more recent evidence shows that DEET acts as a true repellant that acts because it is unpleasant to the insect: A type of olfactory receptor neurons in special antennal sensilla of mosquitoes has been identified that is activated by DEET as well as other known insect repellants such as eucalyptol , linalool , and thujone . Moreover, in a behavioral test DEET had a strong repellant activity in the absence of body odor attractants such as 1-octen-3-ol , lactic acid , or carbon dioxide and female and male mosquitoes showed the same response. [3] [4] (PARADIGM SHIFT)

35. Fig. 1-16, p. 24 Reliance on Solar Energy Population Control Nutrient Recycling Biodiversity