Mono green still works very well. It doesn't perform much differently than a fully optimal Elves list. You lose some sideboard options and the flexibility of Deathrite Shaman without black, but the Glimpse chain and Natural Order plan aren't weakened by being mono chromatic. A lack of fetchlands will hurt the NO plan so I recommend you get fetches even for the mono-g version as they'll help to find Arbors and thin your deck of lands during a Glimpse chain.
4 Windswept Heath
4 Verdant Catacombs
2 Misty Rainforest
4 Forest
1 Dryad Arbor
2 Gaea's Cradle
4 Glimpse of Nature
4 Green Sun's Zenith
3 Natural Order
2 Crop Rotation
3 Llanowar Elves
3 Fyndhorn Elves
4 Quirion Ranger
4 Wirewood Symbiote
4 Nettle Sentinel
4 Heritage Druid
4 Elvish Visionary
1 Birchlore Rangers
1 Priest of Titania / Wirewood Hivemaster
1 Regal Force
1 Craterhoof Behemoth
//Sideboard
1 Dryad Arbor
1 Natural Order
1 Progenitus
2 Thorn of Amethyst
4 Mindbreak Trap
1 Scavenging Ooze
1 Bojuka Bog
2 Umezawa's Jitte
1 Qasali Pridemage
1 Gaddock Teeg
Thanks to GSZ, I think it's wise to keep Pridemage and Teeg even without a Savannah. So there you go. It definitely would compete.