Final answer:
Anne should describe harnessing energy from solar panels for her science fair project on renewable energy, as this method uses a sustainable and environmentally friendly source of energy.
Step-by-step explanation:
Anne's project for the science fair focuses on renewable energy, an important and timely topic given the current environmental and economic challenges associated with non-renewable energy sources. Among the activities listed, harnessing energy from solar panels is the one that uses a renewable source of energy. Unlike burning coal or oil, which are non-renewable fossil fuels that contribute heavily to carbon emissions and global warming, solar energy is sustainable, harnessing the sun's power to generate electricity.