As usual with these images, a size relation is missing.
The example of the Before and After of the glacier, with 20 years time diffenrence is very unimpressive. Do I miss something? I would have thought that the reduction of the glacier over two decades would be much more visible.
Apart from that: I really like the UX of the page. Especially the option to choose between the 3 comparison techniques:
- Side by side
- Curtain
- Toggle
There’s no size key so it’s hard to tell. It could be the size of Maine for all you know.