Air, light, water, noise, etc. are all proof of the overall presence of humanity. Their impact can be felt and seen through pollution signatures on the world, even from space. Therefore, intelligent aliens remotely look for life on Earth. They may not search too hard to sense human existence on our planet.
As per the research of experts of the remote sense, the prospectus to detect plant life on planets is more straightforward. It is due to the chlorophyll that is the essential component of the photosynthesis process, and its presence would give a distinct red-colored edge to the earth.
But in order to detect intelligent civilizations like ours, indicators needed to use different technology. As chlorophyll signifies a plant’s presence, pollution signifies humanity’s existence is associated as the signature markers that generates due to our actions. Waste heat from industries and homes, artificial light at night, chemicals emitted through anthropogenic sources make up the atmosphere.
However, these things lead to arise a question: Could such kins of artificial and atmospheric constituents give away to the presence of alien species on different distant planets?
Recent research and report examined the usage of JWST or James Webb Space Telescope to search industrial pollutants involved in the atmosphere reveals some other planets are located outside our solar system. The James Webb Space Telescope is currently preparing its mirrors and instruments for the operation.
If one of the worst and notable byproducts of humanity that can make humans easily detectable, and makes the case similar to detecting other intelligent life. Therefore, if long-lasting greenhouse gasses and associated agents are found somewhere else in the galaxy, then it may indicate the presence of a civilization that is capable of rampant industrialization.
For example, this technique would not work if the planet under examination revolves around a too bright star-like Sun that will drown the signal out. Instead, dim stars like M-class would be ideal, especially they are ones that are stable and old enough to be conducive.
With the JWST launch, humanity on the planet may be close to the milestone in SETI that is also known as “Search for Extra-Terrestrial Intelligence”. It is the place where people are capable to detect nearby stars that are not just powerful, transient, deliberate, and highly directional transmissions, but also consistent and passive techno-signatures as our own strength.