What did they have to do in order to combat the carbon dioxide problem?

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

How is an endothermic reaction identified