Start Carbon dating issues

Carbon dating issues

It is difficult to predict how the mixture of factors caused by global warming will impact the way crops grow around the world, but a new study shows the increase in carbon dioxide in the atmosphere might help crops grow more in some parts, in spite of the changing climate Many studies indicate that as temperatures rise, crops across the world will suffer as average temperatures become unsuitable for traditionally grown crops, and droughts, heat waves or extreme bouts of precipitation become more common.

Based on the current biomass of these crops, the researchers predict water-use efficiency will rise an average of 27 per cent in wheat, 18 per cent in soybeans, 13 per cent in maize, and 10 per cent in rice.

Taking it all into account, the study projects that average yields of current rain-fed wheat areas, mostly located in higher latitudes including the US, Canada and Europe, might go up by almost 10 per cent, while consumption of water would go down a corresponding amount.

Average yields of irrigated wheat, much of India and China's production, could decline by 4 per cent But the researchers warned the uncertainties in the models are high, because field experiments, which involve blowing carbon dioxide over large farm fields for entire growing seasons, have only been done at a handful of sites.

Bruce Kimball, a retired researcher with the US Department of Agriculture who has studied crop-carbon dioxide interactions, said the paper does 'a good job on a huge scale,' but 'more data from more crops from more locations' is needed.

Based on the current biomass of these crops, the researchers predict water-use efficiency will rise an average of 27 per cent in wheat, 18 per cent in soybeans, 13 per cent in maize, and 10 per cent in rice.'To adapt adequately, we need to understand all the factors involved,' said lead author Delphine Deryng, an environmental scientist at Columbia University's Centre for Climate Systems Research, the NASA Goddard Institute for Space Studies and the University of Chicago's Computation Institute.

Average yields of current rain-fed wheat areas, mostly located in higher latitudes including the US, Canada and Europe, might go up by almost 10 per cent, and consumption of water would go down a corresponding amount.

Here are some of the most common radiometric methods: Radiocarbon dating: Sometimes called carbon-14 dating, this method works on organic material.

Both plants and animals exchange carbon with their environment until they die.

The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results.

Sometimes only one method is possible, reducing the confidence researchers have in the results. “They’re based on ‘it’s that old because I say so,’ a popular approach by some of my older colleagues,” says Shea, laughing, “though I find I like it myself as I get more gray hair.” Kidding aside, dating a find is crucial for understanding its significance and relation to other fossils or artifacts.

Afterward, the amount of the radioactive isotope carbon-14 in their remains decreases.