कौन सा अपशिष्ट प्रबंधन घटक नगर पालिका ठोस अपशिष्ट (MSW) से तापीय ऊर्जा पुनर्प्राप्ति (thermal energy recovery) में सीधे योगदान देता है?

Prolonged exposure to extreme cold temperatures may result in tissue damage known as frostbite, which is categorized as a:

In the context of ecosystem energy dynamics, which of the following expressions correctly defines Net Primary Productivity (NPP)?