Scientists

Using data from the 180 companies with the highest carbon emissions—fossil fuel and cement producers—research has calculated that these companies contributed 50% to the increase in heatwave intensity since 1850-1900. The authors estimate that the individual emissions of each large polluting company may have contributed to the occurrence of between 16 and 53 heatwaves. The study, published in Nature, also shows that a quarter of the heatwaves recorded between 2000 and 2023 would have been virtually impossible without anthropogenic climate change.

A study co-led by the Hospital Clínic-IDIBAPS in Barcelona presents a new methodology for studying the origin and evolution of cancer and predicting prognosis. This approach is based on the study of epigenetic DNA methylation signatures in the specific case of a type of leukemia, chronic lymphocytic leukemia. The researchers, who publish their results in the journal Nature, suggest that the tool could also be applied generally to other tumors.

More than 350 million people in North America and Europe may have been affected by fine particulate matter (PM_2.5) pollution from the 2023 Canadian wildfires, according to estimates from a study published in Nature. The authors estimate that 5,400 acute deaths in North America and 64,300 chronic deaths in North America and Europe were attributable to exposure to these particles originating from Canadian forest fires.

A Canadian team analysed samples from women undergoing in vitro fertilisation and found that higher concentrations of THC metabolites—the main psychoactive substance in cannabis—were associated with a higher rate of oocyte maturation and a lower number of embryos with the correct number of chromosomes. The latter could be replicated at similar concentrations under laboratory conditions. The authors, who published their findings in the journal Nature Communications, acknowledge that the study does not have sufficient statistical power to draw conclusions, but it does warn of possible risks to women's fertility.

The miscarriage rate is higher in women who have had a computed tomography scan before pregnancy than in those who have not been exposed before conception, according to a study published in the Annals of Internal Medicine. The research includes data on more than five million pregnant women in Canada between 1992 and 2023. According to the study, the miscarriage rate increases with the number of scans: from 117 miscarriages per 1,000 pregnancies in women who have had a single test, to 142 in those who have had three or more – compared with 101 miscarriages per 1,000 pregnancies in women who have not had a previous scan.

The cyanobacterium Prochlorococcus, the smallest and most abundant photosynthetic organism on Earth, is an important producer of oxygen and is crucial to marine ecosystems. A team from the United States has collected data from ships sailing the Pacific Ocean over a ten-year period and concluded that these cyanobacteria could experience population declines of between 17% and 51% in tropical oceans by the year 2100, depending on the warming scenario. The results, which are the product of modeling work, are published in the journal Nature Microbiology and indicate that this microorganism is more vulnerable to climate change than previously thought.

The use of creatine among athletes is not new, although its consumption has become popular on social media. We answer questions about this compound with the help of experts in nutrition, sports and dietetics.

The Planetary Health Diet promotes environmentally sustainable consumption, based, among other things, on increasing vegetable intake and reducing dairy and red meat consumption. Previous studies had found an association with better human health, although there were some conflicting results. Now, a study combining two cohorts of more than 150,000 people and a meta-analysis of 37 studies involving more than three million volunteers reinforces this association, finding that greater adherence to the diet is associated with lower all-cause mortality. The results are published in the journal Science Advances.

Climate change has made the hot, dry and windy weather conditions that spread fires across the Iberian Peninsula 40 times more frequent and 30% more intense than in the pre-industrial climate, according to a rapid study by World Weather Attribution. The ten-day heatwave was also 200 times more likely and 3°C hotter due to climate change. The study, which analysed weather observations rather than climate models, warns that fires in Europe are overwhelming firefighting resources and highlights the importance of controlling vegetation in affected areas.

Previous studies had confirmed the presence of liquid in Mars' core. However, there was conflicting information about the possible existence of a solid component. Now, data from NASA's InSight mission show that there is indeed a solid component in the planet's core, whose radius is estimated at about 600 kilometers. The data, published in the journal Nature, may increase our understanding of the formation and evolution of Mars, as well as its potential habitability.