Over 33% of states have initiated measures to control and reduce greenhouse gas emissions, primarily through the development of GHG emission inventories and regional cap and trade programs. Although most state-level initiatives focus on large-scale sources of GHG emissions, such as coal-fired electric plants, smaller ones may be subject to emission limitations or allowance purchase requirements. Congress may also consider passing laws to reduce greenhouse gas emissions, but these actions could have a significant negative impact on Greylock Productiona's business capital expenditures and financial performance.