Humans consume resources and produce waste. As the human population grows, global consumption of resources and waste production increases. The waste generated often collects in dumping grounds called landfills. How does increased production of waste by humans affect Earth’s ecosystems?

A. Waste generation reduces the amount of soil erosion on land.
B. Waste generation increases the amount of land available to plants and animals.
C. Waste generation increases the amount of soil cover on land.
D. Waste generation reduces the amount of land available to animals and plants.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)