This is the original image with the green screen. I then selected the Magic Eraser Tool which is circled.

I clicked a few times on the green with the eraser, deleting parts of it away until it looked like this.

To delete the extra small parts I just used the standard eraser tool, selected a higher diameter and erased the few tiny bits.

Deleting an entire background would be impossible without the green screen. Because of the bright colour it clashes so much with whoever is stood in front of it that whole sections are deleted easily without deleting parts of the image we wish to keep. This leaves a professional looking image.