Because it's a waste of money. You don't need satellites to measure CO2 levels. Ground based measurements work perfectly fine, which is where air is densest. These satellites are supplementary and are fairly imprecise in measuring CO2 as they look at reflected sunlight from the surface. Note that the satellite can't measure through clouds, which is 2/3 of the atmosphere at any given time.

This is a satellite you probably never heard about before but you were moved by an overemotional headline that a journo used to manipulate your pretenses.