Which one of these is a method for energy recovery in landfills?

Harnessing heat from thermal destruction processes is indeed a method for energy recovery in landfills. This process involves capturing the heat generated from the combustion of organic materials present in the waste. When landfills implement thermal destruction techniques, such as incineration, they not only reduce the volume of waste but also produce energy in the form of heat that can be utilized for electricity generation or for heating purposes. This method contributes to energy recovery by converting waste into a usable form of energy, helping to reduce reliance on fossil fuels and promoting sustainability.

The other methods mentioned do not directly relate to energy recovery. Collecting metals for reuse focuses on recycling materials rather than energy production. Sorting waste streams manually is important for recycling but does not generate energy itself. Compacting waste for transport is primarily a logistical function to reduce volume and enhance transportation efficiency, rather than a method of recovering energy from the landfill.