Subordinating conjunctions

I think it's better to get around by bicycle _________ driving your car everywhere.

I'm concerned that carbon dioxide levels are rising ________ increased burning of fuels.

I'm worried that congestion on the roads is still a problem, ________ improvements.

It's annoying that people often throw away plastic bottles _________ you can recycle them.

I think we use things like lemon juice as a cleaning product _________ we don't buy so many toxic chemicals.

We should reduce our energy use _________ protect the environment.

It worries me that obesity in children is becoming more of a problem _________ unhealthy eating habits.