The forest was growing closer with each passing day

It was funny. If you sat down and watched them, keeping your eyes on them at all times, then they never seemed to move. Because why would they? 

But draw a line in the soil, just a few meters in front of one, and you'll realise that, sooner or later (and sooner seemed to be happening more often than later), the long, thick roots of the enormous tree would begin to cross it. After a while, you wouldn't see it at all. 

It was very slow at first. You would hear a mention of the pathways around your local greenbelt eroding quicker for some reason, and that the surrounding foliage seemed denser. In a lot of places around the world, this was put down to the heavy rains of the previous seasons, resulting in a more abundant growth spurt throughout the plant life of the region.

And there were more birds in the sky. And in the trees. Everywhere you went, the sound of birdsong followed. 

But suddenly it felt like you only ever saw the sun through the branches of a tree. Leaves littered the ground everywhere you went. And everyone everywhere couldn't shake the feeling that walls were closing in around them.

It was only when roads began to break apart from tree roots, interrupting our daily commutes,  that the world began to pay attention.

Studies were done, and measurements were taken, and yes, the surrounding forests were definitely encroaching more and more upon the cities. It wasn't anything to be concerned about, although it was odd. But steps had to be taken. Lines had to be drawn. And trees had to be cut back. 

Maybe that's when people started to panic. The front lines were cut back, but the roots and branches and trunks and leaves and twigs and sprouts and shoots kept growing and moving and taking over. The more we cut back, the more there seemed to be. Work stopped, schools closed, shops shut down. We are too busy trying to stem the tide. Soon, the power went out everywhere. Or maybe the lights were just too covered by the trees. Regardless, they were everywhere now. The forest had won.   

I think the difference is that they don't have to sleep. Or maybe they’ve just been asleep for a long time. Maybe they have finally woken up?

I've drawn some more lines in the sand; it's basically a circle now because they're all around me. It's funny, if you sit down and watch them, they never seem to move, but the distance between their roots and my lines is getting smaller and smaller. Soon I won't be able to see it at all.