CREATE TABLE table_22011 ("Name" TEXT, "Volume" TEXT, "Engine" TEXT, "Fuel" TEXT, "Output" TEXT, "Torque" TEXT, "Engine ID code ( s ) " TEXT, "0\\u2013100km/h , s" TEXT, "Top speed" TEXT, "CO 2" TEXT, "Years" TEXT)

Name the total number for co 2 for atd/axr
SELECT COUNT("CO 2") FROM table_22011 WHERE "Engine ID code(s)" = 'ATD/AXR'
SELECT COUNT("CO 2") FROM "table_22011" WHERE "Engine ID code(s)" = 'ATD/AXR'