Engineers and ecologist need to work together more often than in past. Ecologists and other environmental scientists need to collaborate with engineers to describe the requirements of important ecological conditions and processes in terms that can be incorporated into engineering design considerations, and continue to work together to develop engineering plans. While planning the developments, it is necessary to consider the impacts and environmental damages. 

Daly and his colleagues have suggested acceptable boundaries for human environmental impacts. These are: rates of extraction of renewable resources should not exceed regeneration rates, rates of waste emission should not exceed the assimilative capacity of the environment, rates of extraction of nonrenewable resources should not exceed the rates at which substitutes are found and developed. 

These guidelines imply a variety of long term performance standards. For example: pumping from aquifers should not exceed recharge rates; pollutant concentration should not increase; soil depth should not decline; harvesting should not cause reductions in population sizes. 

Based on defined ecological constraints, engineers can develop designs or management plans with potential for meeting them. Chemists and chemical engineers will have to work together to address environmental related challenges in the chemical science and engineering. These include: major increase in analytical capabilities-detection, monitoring, and measurement, new methods for waste treatment and pollution prevention, interface of the chemical sciences with biology, physics, engineering, material science, mathematics, computer science, atmospheric science, meteorology, and geology. A systems approach for spatial and temporal management of environmental-impact sources where the impacts are generated in a processing and manufacturing sequences should also be considered. 

Engineers should also concentrate on development of new analytical instruments and tools to address three principal areas of measurement: laboratory analysis; field measurement; and theoretical tools for modeling and comparison with experiment to address the challenges of sampling and monitoring-air, water, and soil-more extensively and frequently evolving management requirements for waste water utilities by introducing waste water treatment in total water management system by reducing overall water demand via water reuse. World?s demand for Energy is rising. Engineers can transform the energy system by making fuller use of low-carbon fuels as well as carbon-free energy system. Transportation accounts for 20% of total emission, industry contributes another 20 %, the domestic and commercial sector emit around 25% and power generation accounts for another 35%. A wide range of policy is called for. For example, in power generation, switching from coal to less-carbonintensive natural gas, even coal could be made carbon free. 

Transportation can be made more efficient by manufacturing ultra-efficient engines which will consume less fuel for higher mileage. Advanced techniques for gasoline injection also hold promise, as do hybrid electric-gasoline cars already on the road. World Health Organization has developed an action plan for member states on transport, environment and health as given below: 

• Integrate environment and health requirements and targets into transport policies.

• Promote modes of transport and land use planning which have best public health impacts.

• Conduct health and environment impact assessment of transport policies.

• Identify the economic cost of transport on the environment and health.

• Ensure special care of groups at extra risk of the negative health effect of transport.