The correct answer is D. Ecotourism lodges in Karnataka often use solar power, rainwater harvesting, and locally sourced materials.
Solar power is a renewable energy source that does not produce greenhouse gases. It is a clean and sustainable way to generate electricity. Rainwater harvesting is a method of collecting and storing rainwater for use during dry periods. It is a sustainable way to conserve water and reduce the demand on groundwater resources. Locally sourced materials are materials that are obtained from within the local area. They are often less expensive than imported materials and can help to support the local economy.
Ecotourism lodges in Karnataka often use these methods to reduce their environmental impact and to promote sustainable tourism.