Calculate the mass of a gas with a density of 0.0065 g/cm3 and volume of 260 cm3

If there are 260 cm³ of this substance, and each cm³
holds  0.0065 grams of mass, then the total mass of
the sample is
                             (260 cm³) x (0.0065 g/cm³)

                          = (260 x 0.0065) grams

                          =               1.69 grams .
                                           (0.00169 kg)

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.