Question 6 (2 points) The single greatest threat to irrigated agriculture is increased human consumption of coal. groundwater depletion global warming flooding Question 7 (2 points) Which of the following lumber harvesting strategies does the most damage to a forest ecosystem? sustainable forest management selter wood-cutting cutting clear-cutting Question 8 (2 points) Erosion can result in a vicious cycle of worsening erosion because rainwater increasingly soaks into the ground plants are less likely to grow in an eroded region the accurnulation of humus inakes erosion more tikely the pH of the soil increases as erosion continues

Groundwater depletion is a pressing concern as it significantly impacts agricultural productivity and ecosystems. Over-extraction for irrigation can lead to lowered water tables, which not only threatens crops but also diminishes the water supply for future generations. As aquifers shrink, the quality of water can also deteriorate, prompting a complex dilemma for farmers and policymakers alike. Clear-cutting, a lumber harvesting method, causes substantial harm to forest ecosystems, as it removes all trees in an area, disrupting wildlife habitats and increasing soil erosion. This practice minimizes biodiversity and can lead to long-term damage, including reduced forest regeneration and altered water cycles. Alternately, sustainable management promotes healthier ecosystems while still producing necessary resources, recognizing the intricate balance between human needs and environmental stewardship.