Density-dependent regulation of populations. Increase in snow cover on mountains at the end of the Tertiary Period. Living organisms emit infra-red radiation. All objects above absolute zero emit radiation. The amount of energy emitted by a living organism depends directly on the temperature of the surrounding air.
All organisms absorb radiation from the ultraviolet, visible and infra-red parts of the spectrum.
The energy of some wavelengths is not absorbed by living organisms. Some tropical and subtropical soils. Layers of silicon oxide plates that lack other minerals. A high content of organic matter. A high concentration of sodium.