This is probably because of a highly incomplete fossil record.
The paper is focused on a detailed reconstruction of the landscape through time in the Grootvleispruit catchment, which contains the highly significant fossil site of Malapa and the remains of the hominin species Australopithicus sediba.
This includes a significant increase in renewable energy deployment: 35% of electricity by 2020 and 50% by 2030, as well as significant new investment in energy efficiency, infrastructure and energy storage systems and the construction of highly efficient fossil fuel plants.
Here are eight things we learned: While renewable power from wind and solar gets up to speed as a solution to our energy needs, it's worth considering gas over coal, he said: We know that technology based on the use of highly polluting fossil fuels – especially coal, but also oil and, to a lesser degree, gas – needs to be progressively replaced without delay.
"It is a highly important fossil and it will certainly put Uganda on the map in terms of the scientific world," Martin Pickford, a palaeontologist from the College de France in Paris, told journalists in Kampala.
On the other hand, just one highly complex fossil, perhaps completely isolated in time by millions of years, can be of great significance because its complexity carries enormous information content.
"We know that technology based on the use of highly polluting fossil fuels -- especially coal, but also oil and, to a lesser degree, gas -- needs to be progressively replaced without delay," Pope Francis wrote in his June 18 encyclical.
Walcott and later workers have used several different methods to excavate these highly delicate fossils.
While no notable victory has been recorded, this campaign has started to stigmatise cultural and arts institutions funded by oil companies in a similar way to the highly successful fossil-fuel divestment campaign.
