Now that Earth Week is drawing to a close, let's see how much you know about the environment. Here's a quiz that will test your expertise on energy consumption, power sources, who's sucking up all the world's resources, and which vehicles are the most (and least) fuel-efficient. We'll place the correct answers upside-down at the bottom of the page. No peeking! Here we go:

ɟ° 33˙1
˙5002 uı ƃuıpuǝ sɹɐǝʎ pǝɹpunɥ ǝɥʇ ƃuıɹnp ‾‾‾‾‾ pǝsɐǝɹɔuı ǝɔɐɟɹns s,ɥʇɹɐǝ ǝɥʇ ɹɐǝu ǝɹnʇɐɹǝdɯǝʇ ɹıɐ lɐqolƃ ǝƃɐɹǝʌɐ ǝɥʇ ˙8

ɹnoɥ
˙ɹɐǝʎ ǝloɥʍ ɐ uı sǝsn plɹoʍ ǝɥʇ uɐɥʇ ‾‾‾‾‾ ǝuo ʇsnɾ uı uns ǝɥʇ ɯoɹɟ ʎƃɹǝuǝ ǝɹoɯ sǝʌıǝɔǝɹ ɥʇɹɐǝ ǝɥʇ ˙7

ɹɐǝlɔnu
¿7002 uı ʎʇıɔıɹʇɔǝlǝ ƃuıʇɐɹǝuǝƃ ɹoɟ ǝsn pǝsɐǝɹɔuı ʍɐs sǝɔɹnos ʎƃɹǝuǝ ƃuıʍolloɟ ǝɥʇ ɟo ɥɔıɥʍ ˙6

suollɐƃ 5˙68
¿uɐlıɯ oʇ oƃɐɔıɥɔ ɯoɹɟ sǝılɟ 747 llnɟ-%57 ɐ uǝɥʍ pǝsn sı uosɹǝd ɹǝd lǝnɟ ɥɔnɯ ʍoɥ ˙5

ʇuǝɔsǝɹolɟ ʇɔɐdɯoɔ
¿ʇʇɐʍ ɹǝd suǝɯnl ʇsoɯ ǝɥʇ sʇǝƃ qlnq ʇɥƃıl ɟo puıʞ ɥɔıɥʍ ˙4

ǝpɐlɐɔsǝ ɔɐllıpɐɔ
(ʌoƃ˙ʎɯouoɔǝlǝnɟ) ¿ǝƃɐǝlıɯ sɐƃ ʇsɹoʍ ǝɥʇ sʇǝƃ sʌns ǝsǝɥʇ ɟo ɥɔıɥw ˙3

ʇloʌ
¿ɹɐǝʎ ʇxǝu ʇno ƃuılloɹ 'ɹɐɔ ɔıɹʇɔǝlǝ s,ɯƃ ɟo ǝɯɐu ǝɥʇ sı ʇɐɥʍ ˙2

lɐoɔ
¿sn ǝɥʇ uı ʎʇıɔıɹʇɔǝlǝ ƃuıʇɐɹǝuǝƃ ɹoɟ lǝnɟ pǝsn-ʇsoɯ ǝɥʇ sı ʇɐɥʍ ˙1