What is the best method to transmit environmental information over long periods?

The best method to transmit environmental information over long periods is to deploy a satellite modem. Satellite modems can provide consistent and reliable communication over extended distances and in remote locations where other forms of communication may not be available. This capability is crucial for collecting and transmitting environmental data from areas that are difficult to access or that lack infrastructure.

While other methods might be used for short-range or specific conditions, they typically do not offer the same level of reliability and duration. For example, radio transmitters may have limited range and require repeaters for long distances, and dropping a Sonde transmitter is generally more applicable for immediate data collection rather than continuous transmission over time. Additionally, using a thermal scanner is primarily for detecting heat signatures rather than transmitting data. Hence, deploying a satellite modem is the most effective choice for long-term environmental data transmission.