Interpreting an Environmental Visual Metaphor

Using the Internet, find and post here an example of an advertisement employing a metaphorical image(s) which is aimed to symbolize a particular issue or aspect of environmental protection. Please try to guess and discuss here what, from your personal perspective, the visual metaphor employed in that advertisement is supposed to symbolize.
Investigate online and include in your response to this activity different ideas and interpretations which this (and/or some similar social advertisement) seems to provoke among other people. Explain what, in your opinion, can be the reasons for multiple interpretations of the same visual metaphor (e. g. different contexts where this advertisement is supposed to be actually used, different media when it can be introduced, differences in people’s perceptual habits and in their cultural customs and traditions, etc.).