Costs drive change, so new options should be watched for.

Three forces drive most human changes - power, wealth and personal impact.

In other cases, American consumers are helping to drive change.

Medicare also has an important role driving changes in the entire health care system.

From there, they take action, driving positive change in their communities, companies and countries.

Those organizations have become critical players in driving social change and reform.

The government believes a voluntary approach will give better information and is more likely to drive positive changes.

Their mission is to "use market forces to drive positive environmental change by inspiring companies to give".

And in the past 20 years, Chinese have seen how economics can drive vast social change.

On the other hand, economic growth may drive technological change and increase energy efficiency.