On Wednesday, November 27, 2019 at 3:07:09 PM UTC-8, Herbert Glazier wrote:
On Tuesday, November 19, 2019 at 10:01:31 AM UTC-8, Sylvain wrote:
CO2 and methane levels vary according to the seasons

https://phys.org/news/2019-11-mars-m...curiosity.html

Still Mars has a very light atmosphere.It needs to grow stuff from its soil..That was Earth's starting place bert

Forgot to add this.Martian's can only breath out.Like the way we fart.Their breath smells like rotten eggs.bert