QUES: The presence of strontium or barium together with chromium determined with an XRF instrument may indicate the presence of anticorrosive paints based on hexavalent chromium but it has not been examined whether similar results would be obtained if the elements are present as alloying elements in steel

correct the punctuation.

CORRECTED: The presence of strontium or barium together with chromium, determined with an XRF instrument, may indicate the presence of anticorrosive paints based on hexavalent chromium, but it has not been examined whether similar results would be obtained if the elements are present as alloying elements in steel.

QUES: Table 1b Fgases their chemical formulas and GWP values stipulated in the Kyoto Protocol

correct the punctuation.

CORRECTED: Table 1.b F-gases, their chemical formulas and GWP values stipulated in the Kyoto Protocol

QUES: Human industries each year send 55 gigatons of CO2 into the atmosphere

correct the punctuation.

CORRECTED:
Human industries each year send 5.5 gigatons of CO2 into the atmosphere.