CREATE TABLE table_203_838 (id DECIMAL, "year" DECIMAL, "world car of the year" TEXT, "world performance car" TEXT, "world green car" TEXT, "world car design of the year" TEXT)

how many world green cars are there before 2007 ?
SELECT SUM("world green car") FROM table_203_838 WHERE "year" < 2007
SELECT SUM("world green car") FROM "table_203_838" WHERE "year" < 2007