Better Climate Screen (UI) 1.3.1

Version 1.3.1
Technical change that allows the mod to stay enabled while Gathering Storm is disabled.

Version 1.3
- Fixed: incorrect handling of a negative CO2 footprint, now total and percentages are properly calculated.
- Added: Carbon Recapture info.

Version 1.2
- Added: Support for Natural Gas mod.
- Added: Info about CO2 levels that trigger phases of climate change.
- Added: Linux compatibility.

Version 1.1
- Added: Civs are sorted by the CO2 footprint in decreasing order.
- Added: Scroller to the civ list.
- Fixed: The average is calculated for all civs except those that have last turn emission = 0 and total emission = 0.