As we mark Earth Day 2026 under the theme “Our Power, Our Planet,” it is easy to take our high-definition, real-time view of the world for granted. Today, we can look at a screen and see live temperature telemetry, locations of field teams, and flood levels.
But this power to protect our planet began with much humbler tools: a pen, a piece of graph paper, and a vision to see the invisible.
In 1938, a steam engineer and amateur meteorologist named Guy Callendar published a landmark study. He was the first to painstakingly compile temperature records from 147 weather stations across the globe. Callendar created the first maps of temperature anomalies, showing that the world was warming in direct correlation with the rise in CO2.
Two decades later, Charles Keeling began plotting atmospheric CO2 concentrations. The resulting ‘Keeling Curve’ became perhaps the most important visualisation of data in human history. By visualising the "breathing" of the planet - the seasonal rise and fall of CO2, Keeling provided the first undeniable visual evidence that human activity was altering the atmosphere.
If Callendar proved the past, James Hansen showed us the future. In his landmark 1981 paper, "Climate Impact of Increasing Atmospheric Carbon Dioxide," Hansen and his team at NASA published what many consider the first modern climate anomaly map.
This map used a colour-coded projection to show that warming wouldn't be uniform. It predicted that the Arctic would warm faster than the equator and that the Western United States would face intensifying dry conditions.
These early visualisations played a key role in helping the wider population to grasp the severity of the situation. They turned abstract chemical equations into a digestible graphic that the public and policymakers could finally see.
As the 20th century progressed, the role of mapping shifted from proving climate change to managing its effects. The first climate models in the 1960s and 70s produced the first heat maps of the future, allowing proactive nations to begin planning for a world of rising seas and shifting rainfall patterns.
We’ve moved from Callendar’s hand-drawn maps to situational awareness platforms which serve as the modern descendants of those early climate maps. While the pioneers mapped the "why" of climate change, today's tools map the "where" and "how" to respond.
The 2026 theme, Our Power, Our Planet, emphasises that responsibility to protect the environment is a collective effort. For agencies who lead this protection, that power is now being supported through advanced situational awareness tools.
The challenge for fire services is increasingly defined by the expansion of the 'high-risk' wildfire window. Between 2011 and 2016, the UK's fire season typically lasted between one to four months; however, data from 2017 to 2021 shows this has extended to between six and nine months of the year. This trend - which we covered in a previous article - has resulted in longer wildfire seasons that can stretch response capabilities.
For fire services, these conditions require more frequent deployments and a greater focus on remote moorlands. Consequently, there is an increased reliance on shared situational awareness. By utilising tools that provide a common operating picture, fire crews and partner agencies can coordinate more effectively.
The journey from Callendar’s desk in 1938 to the control room in 2026 is a story of increasing clarity. We have moved from the initial discovery of a warming world to the tactical defence against its side effects.
The pioneers gave us the power to know. Today, situational awareness tools give us the power to act. As we reflect on Earth Day 2026, we remember that one of the most powerful tools in our arsenal remains the same as it was a century ago: the ability to see our planet clearly.