UNEP International Resource Panel : Activities and Assessment Report on Resource Efficiency

nteraction of nutrient resource and crop diversity on resource use efficiency in different cropping systems

introduction conventional operations in fields, soil and water management are not efficient and loss of and damage to the environment are considerable (lal, 2000). crop diversity and understanding the complex interactions between environmental and socioeconomic factors are approaches to make better use of limited resources (tengberg et al., 1998). the most diverse ecosystems have a higher produ...

interaction of nutrient resource and crop diversity on resource use efficiency in different cropping systems

introduction with the continuous growth of world population, degradation and ecological imbalance throughout the world, there is a need to increase agricultural production and environmental protection measures. in this respect, efforts to supply nutrients to the environment are at the head of the programs. one of the ways to approach this goal is the use of intercropping systems (najafi & moham...

Efficiency, Production, and Resource Consumption

This work explores the historical effectiveness of efficiency improvements in reducing mankind’s impact on the earth. Ten activities are analyzed, including pig iron production, aluminum production, nitrogen fertilizer production, electricity generation from coal, oil, and natural gas, freight rail travel, passenger air travel, motor vehicle travel, and refrigeration. The data and analyses pres...

Bounding the Resource Availability of Activities with Linear Resource Impact

We introduce the Linear Resource Temporal Network (LRTN), which consists of activities that consume or produce a resource, subject to absolute and relative metric temporal constraints; production and consumption is restricted to linear functions of activity duration. We show how to construct tight bounds for resource availability as a function of time in LRTNs; for a broad class of problems, th...

Resource Efficiency in Development Cooperation