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  2. Reserves-to-production ratio - Wikipedia

    en.wikipedia.org/wiki/Reserves-to-production_ratio

    The reserve portion of the ratio is the amount of a resource known to exist in an area and to be economically recoverable (proven reserves). The production portion (denominator) of the ratio is the amount of resource produced in one year at the current rate. [1] RPR = (amount of known resource) / (amount used per year)

  3. R* rule (ecology) - Wikipedia

    en.wikipedia.org/wiki/R*_rule_(ecology)

    The R* rule (also called the resource-ratio hypothesis) is a hypothesis in community ecology that attempts to predict which species will become dominant as the result of competition for resources. [1] The hypothesis was formulated by American ecologist David Tilman. [2]

  4. Ideal free distribution - Wikipedia

    en.wikipedia.org/wiki/Ideal_free_distribution

    As an optimal foraging model, the Ideal Free Distribution predicts that the ratio of individuals between two foraging sites will match the ratio of resources in those two sites. This prediction is similar to the Matching Law of individual choice, which states that an individual's rate of response will be proportional to the positive ...

  5. Material input per unit of service - Wikipedia

    en.wikipedia.org/wiki/Material_input_per_unit_of...

    This allows comparisons of resource consumption of different solutions to produce the same service. When a single product is examined, the MIPS calculations reveal the magnitude of resource use along the life-cycle and help to focus efforts on the most significant phases to reduce environmental burden of the product.

  6. Energy return on investment - Wikipedia

    en.wikipedia.org/wiki/Energy_return_on_investment

    The issue is still subject of numerous studies, and prompting academic argument. That's mainly because the "energy invested" critically depends on technology, methodology, and system boundary assumptions, resulting in a range from a maximum of 2000 kWh/m 2 of module area down to a minimum of 300 kWh/m 2 with a median value of 585 kWh/m 2 according to a meta-study from 2013.

  7. Efficiency - Wikipedia

    en.wikipedia.org/wiki/Efficiency

    Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C, where P is the amount of useful output ("product") produced per the amount C ("cost") of resources consumed.

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Emergy - Wikipedia

    en.wikipedia.org/wiki/Emergy

    The amount of resources that money buys depends on the amount of emergy supporting the economy and the amount of money circulating. An average emergy/money ratio in solar emjoules/$ can be calculated by dividing the total emergy use of a state or nation by its gross economic product.