China's rapid economic expansion combined with the country's relaxed environmental oversight has caused a number of ecological problems. In response to public pressure, the national government has undertaken a number of measures to curb pollution in China and improve the country's environmental situation. However, the government's response has been criticized as inadequate. Encouraged by national policy that judges regions solely by their economic development, corrupt and unwilling local authorities have hampered enforcement. Nonetheless, in April 2014, the government amended its environmental law to better fight pollution.