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The U.S. Environmental Protection Agency’s decision to withdraw federal greenhouse gas limits for power plants is expected to increase carbon dioxide emissions from the sector by about 123 million metric tonnes over the next decade, according to the agency analysis cited by Oilprice.com. The rollback removes a key mechanism for regulating greenhouse gas emissions from coal and gas fired power plants under the Clean Air Act. The previous standards introduced in 2024 were projected by the EPA to deliver significant emissions reductions along with health and economic benefits. Under the new analysis, power plant operators could save about $370 million in direct compliance costs. However, the assessment does not include the economic value associated with health benefits that could result...

  Delhi air quality has deteriorated sharply in October with the city average Air Quality Index (AQI) more than doubling as the winter pollution season gets underway. The rise comes as changing weather conditions, lower wind speeds and increased atmospheric stability begin to trap pollutants closer to the ground. The government has also introduced a new winter pollution protocol aimed at strengthening monitoring and enforcement. However, Delhi is not the only city witnessing a significant deterioration in air quality. Several cities across the National Capital Region and other parts of north India also experience worsening pollution during the post monsoon and winter months. The seasonal increase is linked to a combination of local emissions from vehicles, road and constru...

  Global warming could weaken the long distance atmospheric connection between the South Asian summer monsoon and the Mediterranean climate potentially changing the factors that influence summer rainfall variability in the region according to a new study published in Nature Geoscience. Researchers led by scientists from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences examined how the relationship between the South Asian monsoon and Mediterranean climate could change under a future high emissions scenario. The South Asian summer monsoon is known to influence weather thousands of kilometres away through a mechanism often described as the “monsoon–desert” connection. During summer, strong monsoon convection releases large amounts of heat into the at...

  India is likely to experience warmer and drier conditions across much of the country in October with the India Meteorological Department (IMD) forecasting below normal rainfall during the month. However some regions could receive normal to above normal rainfall during the broader October-December post-monsoon period. The southwest monsoon officially ended on September 30 after India recorded a 13% rainfall deficit. The country received 759.4 mm of rainfall during June-September compared with the normal 868.6 mm. The IMD has attributed part of the rainfall deficit to El Niño conditions in the tropical Pacific which emerged in June and strengthened during the monsoon season. Strong El Niño conditions are currently prevailing and may continue until March 2027. The IMD expec...

  Severe drought and falling water levels in major rivers are increasingly disrupting inland shipping reducing the amount of cargo barges can carry and pushing up freight costs, according to the International Transport Forum (ITF). Major European waterways including the Rhine, Danube, Loire and Po recorded exceptionally low water levels in recent months. During August 2026, barges travelling through parts of the Rhine could carry only about 15% of their normal cargo capacity while capacity on the Danube fell to around 30%. The problem is expected to worsen as climate change increases the frequency and intensity of hydrological droughts. The ITF estimates that under high emission climate scenarios, average summer discharge on the Rhine could decline by up to 10% by 2050. Re...

  Researchers from Hunan University of Technology in China have found that adjusting the rate at which air is injected into underground compressed air energy storage (CAES) caverns can improve storage efficiency. The study compared four different air injection methods while keeping the total amount of stored air the same. Researchers found that gradually increasing the airflow rate from 10 kg/s to 150 kg/s raised the energy storage rate to 87.5% compared with 85.5% under a constant injection rate. The increasing flow method also raised the average cavern temperature by about 1 kelvin and pressure by 0.13 MPa. The work done on the compressed air increased by around 12.7%, while heat loss to the surrounding rock rose by approximately 11%. The researchers also examined the im...

  Scientists at the University of Stuttgart in Germany have developed a 3D printed fuel injection system designed to help compact gas turbines operate on a variety of fuels, including hydrogen, kerosene, methanol, natural gas and synthetic e-fuels. The new injector adapts technology originally developed for aircraft turbine engines. Its design aims to produce a fine and evenly distributed fuel spray helping improve combustion while limiting emissions such as soot and nitrogen oxides. Using additive manufacturing, researchers were able to create complex internal passages in the injector. Although metal 3D printing can leave rough surfaces that affect fuel flow through small openings laboratory tests showed that the new design could still achieve clean combustion. The techno...

  Chennai, October 2: El Niño has strengthened sharply in the tropical Pacific, with the Nino3.4 index reaching 2.72°C for the week ending September 27, making it the second highest weekly value recorded since 2008 according to Australia’s Bureau of Meteorology. The latest reading is well above the El Niño threshold of 0.8°C and only slightly below the record weekly value of 2.76°C recorded in November 2015. Climate models indicate that Pacific Ocean temperatures could rise further through October and November. Most models are forecasting the Nino3.4 index to cross 3°C, with the peak potentially occurring between December and February and conditions continuing into early 2027. Model projections suggest the event could reach levels above the warmest El Niño conditions recor...

New Delhi, October 2: A committee appointed by the Supreme Court has identified domestic sewage as the biggest source of pollution in the Yamuna with Uttar Pradesh accounting for the largest sewage treatment gap among the states along the river according to its report. The six member panel headed by the Union Home Secretary assessed sewage generation across Uttarakhand, Himachal Pradesh, Haryana, Delhi and Uttar Pradesh. It estimated that around 7,999 million litres per day (MLD) of domestic sewage is generated in the Yamuna catchment. Of this, about 6,243.83 MLD is currently treated leaving nearly 1,756 MLD untreated. This represents a treatment gap of around 22%. The committee noted that 520 major drains discharge into the Yamuna basin. Uttar Pradesh has a sewage treatment gap o...

  A temporary rise above global warming targets such as 1.5°C or 2°C could cause long lasting changes in the climate system even if global temperatures later return below those thresholds according to a new study led by researchers at Concordia University. The research examined how different parts of the climate system respond when warming temporarily exceeds a target. Scientists used the University of Victoria Earth System Climate Model to compare 42 pairs of climate scenarios. In each comparison, one scenario temporarily crossed a warming threshold before returning to the target pathway while the other remained below the threshold throughout. Researchers measured the extent of warming overshoot using “degree-years”, which accounts for both how far temperatures rise above...