An underwater photo of canopy-forming kelp with rays of sunlight illuminating their translucent leaves. 
Still from satellite view imagery over Hunga Tonga–Hunga Haʻapai volcano eruption site
Hoover Dam and Lake Mead, with mountains on either side
A blue, green and yellow banner that reads, from top to bottom: blue + gold = green | Celebrating Earth Month at UCLA
Vacant fenced-off land with the works "Small Lots - Big Impacts" superimposed in white font.