by eLife, December 18, 2018 in ScienceDaily
Scientists have described a fossil plant species that suggests flowers bloomed in the Early Jurassic, more than 174 million years ago, according to new research in the open-access journal eLife.
Before now, angiosperms (flowering plants) were thought to have a history of no more than 130 million years. The discovery of the novel flower species, which the study authors named Nanjinganthus dendrostyla, throws widely accepted theories of plant evolution into question, by suggesting that they existed around 50 million years earlier. Nanjinganthus also has a variety of ‘unexpected’ characteristics according to almost all of these theories.
by Ron Clutz, December 18, 2018 in ScienceMatters
Over the last 40 years global-mean surface air temperature – ‘global temperature’ for short – has gained an extraordinary role in the science, politics and public discourse of climate change. What was once a number crudely calculated through averaging together a few dozen reasonably well-spaced meteorological time series, has become reified as an objective entitythat simultaneously measures Earth System behaviour, reveals the future, regulates geopolitical negotiations and disciplines the human imagination. Apart perhaps from GDP rarely can so constructed an abstract entity have gained such power over the human world.
by P. Homewood, December 18, 2018 in NotaLotofPeopleKnowThat
Negotiators in Poland have finally secured agreement on a range of measures that will make the Paris climate pact operational in 2020.
Last-minute rows over carbon markets threatened to derail the two-week summit – and delayed it by a day.
Delegates believe the new rules will ensure that countries keep their promises to cut carbon.
The Katowice agreement aims to deliver the Paris goals of limiting global temperature rises to well below 2C.
“Putting together the Paris agreement work programme is a big responsibility,” said the chairman of the talks, known as COP24, Michal Kurtyka.
“It has been a long road. We did our best to leave no-one behind.”
La géologie, une science plus que passionnante … et diverse