We need them both. Yes, so it is...

Beautiful light and colors

Une courbe de fumée dans ce doux ciel quelle vue et iamge
Belle journée
Nicou

Ah, the eternal conflict . . I dare say my local air is cleaner than it once was in the days of coal but still ways to go.

We see this polluted scene all too much. I am on the side of nature.

Une très belle photo la pollution faite par l'homme

such beautiful composition, fumes, colors & lights!
Amazing!

Our world today ! Superb composition !

une intéressante recherche avec du bon travail

Yes!

Nicely contrasted image (and thoughts)!

es como para reflexionar . me quedo con la naturaleza y las energías renovables . muy buena foto , un abrazo Ana

Beautiful..............
Nature fighting pollution too :)

Who'll win ??????? Hope !!!!!! Love this picture,Anà L' ....

We need both of them and together.
My best whishes for 2018 dear friend.

Appealing symmetry and lovely colours in this interesting and telling juxtaposition!

A beautiful image to illustrate the struggle.

A fantastic contrast. Beautiful color in the sky! A great image that says a lot.

Nature will eventually win.

looks like a steam locomotive coming over the horizon

Visto assim, até dá a ideia que a árvore está a sugar todos os vapores nocivos.
E penso que foi exactamente essa a tua ideia para o enquadramento/composição.

E nesta guerra de titãs é bom não esquecer que não pode haver vencedores.