Yeah @jamie_brown49, but a bike factory's footprint is tiny next to making and fueling a car. The average car emits about 4.6 tons of CO2 a year just from driving. Bike parts might have some impact, but it's a fraction of that. It's about picking the less bad option, not a perfect one.
Totally get that. Switched to a steel frame bike years ago and it's still going strong with basic maintenance. The parts that do wear out are pretty minor in the big picture.