HONOLULU — Depletion of certain gut bacteria, and an elevated level of other bacteria, are associated with an increased risk for dementia, a new study suggests. “Although our study has numerous limitations, the results suggest that the gut microbiome could be a new…
From ice core samples, (measurements which were made prior to 1950), the levels have been between 250–300 ppm for thousands of years (quite stable). (There are some controversies over the accuracy of using ice core samples). So the general consensus backed by evidence would show that CO2 levels have increased sharply during the last few hundred years. So if we take 250ppm increasing to 400ppm we get 37.5% increase (or what is commonly heard, 40% increase over the last several hundred years).
RE: Scientific Method Checklist:
“The checklist is badly needed. One cannot rely on the fact that a purported discovery was published in a high-status scientific publication. When we used the checklist to rate papers published in leading scientific journals, we found less than one percent of them to be compliant with the scientific method.”