Why you think its photoshoped? perhaps its too good to believe? He did TED talk with more photos of the tree. It would be very unlikely for him to not disclosed in venues like TED that these were photoshopped.
That image is clearly photoshopped. The image quality of the tree pixels vs the background, the strange lighting discrepancies and the shadow on bottom left of the planter box that is somehow towards the light.
Look at the transition at 29 seconds in that talk [1]. The clouds are in the same place.
Look at the transition at 29 seconds in that talk [1]. The clouds are in the same place.
[1]https://www.youtube.com/watch?v=t9EuJ9QlikY#t=29
I don't hold anything against the artist though, the article just picked a terrible image to use.