A new study suggests that streaming services can lead to higher levels of greenhouse gas emissions. Researchers say the results depended, in part, on which technology was being used to send data. The German government provided money for the study. Germany’s Federal Environment agency published a report on the findings. Many studies have linked “greenhouse gases,” such as carbon dioxide, to rising temperatures in Earth’s atmosphere. Greenhouse gases are a product of pollution from factories and other human activities. Streaming services send videos, games, music, and other material over the internet so that people can watch or listen to it immediately. The researchers estimated the amount of carbon dioxide produced by data centers where material is stored for streaming. It also looked at the technology used to get the data to consumers. The report found that streaming video over fiber optic cables results in the lowest amount of carbon dioxide, or CO2 emissions 2 grams per hour. Copper cables produced twice that amount. 3G mobile technology resulted in 90 grams of CO2 emissions per hour. The report said streaming over 5G, another wireless technology, would result in carbon dioxide emissions of 5 grams per hour.