Climatic changes Atmospheric ozone Environmental aspects Climatic changes Forecasting Climatic changes Risk assessment Global warming Forecasting Global warming Risk assessment Greenhouse gas mitigation Greenhouse gas mitigation Standards Greenhouse gases Greenhouse gases Environmental aspects Greenhouse gases Forecasting Greenhouse gases Risk assessment Acid rain Air Pollution Air Pollution Law and legislation Compliance costs Air quality management Atmospheric nitrogen oxides Environmental aspects Atmospheric ozone Law and legislation Compliance costs Boilers Efficiency Measurement Methodology Carbon Environmental aspects Carbon dioxide mitigation Climate change mitigation Climatic changes Detection Climatic changes Government policy Climatic changes Monitoring Coal trade Energy conservation Energy consumption Climatic factors Energy consumption Environmental aspects Environmental indicators Monitoring