I applaud you for answering this question in a levelheaded way.

Every action you take as a human is detrimental to the environment. Each activity could be replaced with a more eco-friendly alternative. If you follow them to a logical conclusion you do nothing.

Why own a car? Public transportation is best!

But wait, public transportation burns fossil fuels, you should instead only use a bike.

Oh no, bikes use parts manufactured and shipped from all over the world, why not walk?

Walking wears out shoes instead go barefoot.

I can't walk barefoot today because it's cold/hot or my feet are damaged. Let's just just do nothing today.

Really what Daan is asking is "Why did you make a decision that I wouldn't have made?". It's not very productive or interesting question. Also that train of thinking would likely lead to a life that wasn't very interesting.