Consistency of global warming trends strengthened since 1880s

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

Wegener and the Continental Drift HypothesisIn the early 1900s, Alfred Wegener, a German scientist, proposed the Continental Drift Hypothesis, the idea that Earth’s continents were once joined together in a supercontinent called Pangaea and slowly drifted apart over millions of years. Although his ideas were not widely accepted then, later discoveries provided evidence supporting continental movement, leading to the modern theory of plate tectonics. Understanding Wegener’s hypothesis helps...

Branches of Earth ScienceEarth Science is the study of our planet, including its land, water, air, and living things. It has five main branches, each focusing on different parts of the Earth.Geology is the study of rocks, minerals, and Earth's natural processes. Geologists learn how fossils form, how rivers shape the land, and how volcanoes erupt.Oceanography focuses on the ocean. Oceanographers study waves, marine life, and the ocean floor. Meteorology is the study of weather and the...

Water Cycle The water cycle describes how water continuously moves through the Earth's atmosphere, surface, and underground layers. This process includes evaporation, condensation, precipitation, infiltration, and runoff. The sun drives the cycle by providing energy for evaporation, while gravity moves water through systems and returns it to bodies of water. The water cycle is essential for replenishing freshwater sources, supporting ecosystems, and regulating climate. Scientists can better...

Tree Rings, Ice Cores, and VarvesScientists use natural records such as tree rings, ice cores, and varves to study past climate conditions. These records reveal temperature, precipitation, and atmospheric composition over thousands of years.Tree Rings – Trees grow new rings each year. The thickness of each ring reflects climate conditions like droughts or wet seasons.Ice Cores – Ice sheets trap air bubbles. Scientists analyze these layers to learn about past temperatures and greenhouse gas...

The correlation coefficient, r, developed by Karl Pearson in the early 1900s, is numerical and provides a measure of strength and direction of the linear association between the independent variable, x, and the dependent variable, y. Hence, it is also known as the Pearson product-moment correlation coefficient. It can be calculated using the following equation: