Although it's not efficient at filtering viruses, so could you trust it? My son says you can use them to drink from public lavatories, but I'm never going to test the Life Straw's efficacy down the dunny.
And every time we buy a souvenir or snack abroad, a plastic bag is inevitably offered but, just as you do at home, how easy to always carry reusable shopping bags. If you've ever visited a turtle sanctuary to learn how the bulk of the inmates are there because of ingesting plastic bags, thinking they're about to snack on a jellyfish, surely that alone should put you off ever accepting one again, wherever you are.
How about emissions from aeroplanes? More than 1.5 billion barrels of jet fuel are used every year and, although many airlines are looking at alternatives to avgas, a workable solution is still a long way off, so every time we fly, our carbon footprint further stomps its mark across the face of the world.
It's said that emissions from international flights account for 2 per cent of greenhouse gases, a figure that's set to triple by 2050, yet electric planes are unlikely to become a reality in my lifetime because the energy density of fuel is higher than the efficacy any battery could hope to offer. Plus, as the fuel burns, the plane becomes lighter thus becoming more efficient, whereas those weighty batteries will stay heavy for the entire journey.
So perhaps we could return to going everywhere on foot? Or by bike or horse? Under sail or by paddle? Because imagine if every time you hugged a loved one, a little bit of them fell off, and that by enjoying them you were destroying them. Wouldn't you look for an alternative to that embrace?
Got a hot tip for reducing your carbon footprint? Let us know travel@nzherald.co.nz