Final answer:
Jack's explanation would address how Global Warming can lead to an ice age by focusing on reduced sunlight reaching the surface, changes in Earth's orbit and tilt, volcanic eruptions, and other climate change dynamics that disrupt Earth's energy balance.
Step-by-step explanation:
Jack may explain the occurrence of an ice age from Global Warming by discussing the complex interplay of factors that affect Earth's climate. For instance, a reduction in sunlight reaching the planet's surface can cause temperatures to drop, particularly at northern latitudes, leading to the accumulation of ice and the expansion of glacial ice sheets. Variations in Earth's orbit and tilt, as described by Milankovitch cycles, along with volcanic eruptions and changes in ocean circulation are also significant contributors to climate change that may trigger an ice age. Once established, increased glacier growth during an ice age can have a profound impact on the global climate, ecosystem, and human populations.
Key events and conditions like massive volcanic eruptions, shifts in Earth's orbit and axis, and even the position of continents affecting ocean currents, play a role. This alteration in Earth's albedo due to the spread of ice can exacerbate cooling, as more solar energy is reflected back into space, reducing the warming effect on the planet. Climate change is the result of a delicate balance of opposing factors, and these events disrupt that balance, potentially leading to the onset of an ice age.