The best replacement for carbon is aluminum arrows.

The best alternatives to carbon are rated as following:
★★★★★  aluminum arrows
★★★★  cocoa
★★  aluminum bike
★★  titanium
★★  silicon
★  aluminum frame
★  aluminum bikes
★  aluminum road bike
★  carbon dioxide
★  aluminum seatpost
★  bovada
★  aluminum handlebars
★  cyanogenmod
★  ceramic infrared saunas
★  stainless steel knives
★  aluminum bike frame
★  steel fork
★  ceramic infrared sauna
★  ceramic tint
  ceramic sauna
  graphite
  titanium bike frames
  sintered brake pads
  aluminium
  steel frame
  ceramic saunas
  pro street
  aluminum mountain bike
  most wanted
  aluminum wheels
  aluminum mountain bikes
  charcoal filter
  cocoa modo
  kevlar
  titanium seatpost
  ipod mini
  aluminium framed
  titanium bicycles
  titanium frame
  reverse osmosis
  metal film resistor
  fiberglass arrows
  ceramic window tint
  alloy seatpost
  steel bike
  zen micro
  aluminium bike
  titanium road bike
  titanium bikes
  alloy
  ceramic heaters
  anthracite

Your alternative for carbon is not listed? Suggest!
Speaking about carbon, one probably shouldn't forget about purigen.

Other search terms related to carbon and their ratings are:
★★★★★ purigen
You have in mind a companion for carbon and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of carbon in all years. Click on graph for more.
carbon
aluminum arrows
cocoa