The amount of the earth’s net primary productivity that human activity consumes, and the amount of the total ice-free land surface devoted to human

25% of the planetary primary productivity

75% of the ice-free land surface.

Explanation:

The researches and various studies have observed and analyzed that the  amount of the Earth’s Net Primary Productivity that human activity consumed is almost 25% of the planetary primary productivity

and,

Out of all the land available on the planet Earth, Human land-uses occupies about 75% of the ice-free land surface.

The net primary productivity may be defined as the productivity rate lefts after the gross primary productivity reduced from the respiration. The plants acts as the producer in the ecosystem.

The humans directly or indirectly depend on plants and other animals for their productivity. The humans activity nearly consumes around 75% from the ice-free land surface. Around 25% of the planetary primary productivity is used directly by the humans for their activity.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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