color scale for Chem/CO2sc is inverted (ubuntu/firefox)

[fguilbaudacr]

Hi,

congrats on an awesome website.

I find that the color code for Chem/CO2sc is inverted: brown indicates low concentrations, blue indicates high concentrations. For example:
https://earth.nullschool.net/#current/chem/surface/level/overlay=co2sc/orthographic=88.02,11.11,486

I'm using ubuntu 14.04 and firefox 57.0.

Thanks