‘Economically driven by agriculture.’ Advocates and researchers say the wildfires devouring the Brazilian rainforest were set by cattle ranchers and loggers who want to clear and utilize the land, emboldened by the country’s pro-business president. About 99% of the fires result from human actions “either on purpose or by accident,” Alberto Setzer, a senior scientist at INPE, Brazil’s space research center, which is using satellite photography to track the fires, told CNN. The burning can range from a small-scale agricultural practice, to new deforestation for a mechanized and modern agribusiness project, Setzer told CNN.

The country’s environmental minister, Ricardo Salles, tweeted on Wednesday that the fires were caused by dry weather, wind, and heat. But CNN meteorologist Haley Brink said the fires are “definitely human-induced,” and can’t be attributed to natural causes like lightning strikes.

“A lot of these fires in the Amazon are economically driven by agriculture,” said Stephen Donofrio, founder of GreenPoint Innovations and an adviser for Forest Trends, which tracks corporations who have set public goals to address such commodity-driven deforestation.

“The sad reality is, corporate ambition only can be successful with government policies that can complement that ambition, as long as of course that those government policies are upheld, which in Brazil right now government is a real problem,” he added, in an email commentary.

On Thursday, Brazilian President Jair Bolsonaro said there was a “very strong” indication that some non-governmental groups could be setting blazes in retaliation for losing state funds under his only months-old administration. He did not provide any evidence.

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Economical method to extract hydrogen gas from oil. A team of Canadian engineers from the University of Calgary have found a large-scale and economical way to extract hydrogen gas from oil reserves, including oil fields and oil sands, the Hydrogen Fuel News reported. The hydrogen that is extracted could then be used to power fuel cell vehicles, including cars, buses, trains. It could even be employed at abandoned oil fields.

The method involves injecting oxygen into the oil fields. This raises temperature and breaks the hydrogen free, which can then be separated from other gases through specialist filters. As hydrogen does not pre-exist in the reservoirs, it is the pumping of the oxygen that creates the reaction to allow hydrogen to form. In their tests, the researchers said that their technique can pull up massive quantities of hydrogen, but leaves the carbon in the ground.

Microplastics ‘don’t appear to pose health risk,’ but more data needed. In its first review on the health risks of plastic in tap and bottled water, the World Health Organization said that microplastics “don’t appear to pose a health risk at current levels.” But there’s more: the review said available information was limited and more research was needed on microplastics and how they affect human health.

“We urgently need to know more about the health impact of microplastics because they are everywhere — including in our drinking water,” said Dr. Maria Neira, director of the Department of Public Health, Environment and Social Determinants of Health at WHO, according to CNN.

WHO said it did not recommend routine monitoring of microplastics in drinking water and said that concerns over microplastics should not distract water suppliers and regulators from removing microbial pathogens, such as those causing deadly diarrheal diseases.

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