In case you've missed the memo, the teenagers are taking over the world.

One speech, one protest, one boat ride at a time.

From climate change marches, to lowering the voting age to 16 campaigns, to telling the UN what a mess adults have made of the world, the time for the voice of youth is now.

Which is not necessarily a bad thing, if it's constructive.

But the pattern I'm picking up on is that a lot of it is combative, negative and preachy with a touch of shaming thrown into the mix.

Does that affect change?  

Is that really the best method? Shouting at people?

It makes the vegans standing in silence at the supermarket meat section look like amateur hour.

The thing about teenagers protesting is that most aren't 100 percent committed to it. They're not all Greta Thunberg.

Some are keen to recycle, save the planet, lower the voting age because all that plays well on social media and sounds good, but they still want to drive their own car, travel, use a lot of devices, wear unsustainable fashion, and attend music festivals where they leave a sea of rubbish behind.

The last climate change march for example had in its wake, a trail of abandoned placards, posters, cans of V and food wrappers just lying all over the road.

So we can take the day off school to march and protest, but we can't quite be bothered picking up our rubbish as we go.

I also wonder how much of the noise from supporting adults praising these shouty teens is from those who don't have a house full of teenagers themselves.

Look, some teenagers can be great, but others don't know how to make their bed or boil and egg, far less pay for the Wi-Fi or worry about taking out the recycling.

When you're raising teenagers, you're a bit more sceptical about how many 'rights' they're arguing for, given most of them are more interested in their mates, their exams, their social life and their social media and asking for petrol money.

Saying all this doesn't make me old and grumpy, nor am I saying it because I'm white (which has to be the oddest argument yet on opposition to the Greta method of protest).

When the teens are chanting hashtag save the planet, hashtag hear our voice, I hear them and I'm keen for all those things.

But you've got to be up for it.

The discourse should be managed in a way where adolescent hysteria can be put to one side, and you're prepared to put your actions where your mouth is.  

Problem is, many teenagers can't be bothered.