Final answer:
The Earth is currently in a greenhouse phase due to the increase in greenhouse gases, primarily carbon dioxide, in the atmosphere.
Step-by-step explanation:
The Earth's current climate is considered to be in the greenhouse phase. The greenhouse effect is the process in which certain gases in the Earth's atmosphere trap heat and contribute to warming the planet. The main greenhouse gas responsible for the current climate conditions is carbon dioxide (CO₂), which has been increasing in concentration primarily due to human activities such as burning fossil fuels.
Supporting evidence for the greenhouse condition includes data on the rise of global temperatures over the past century, the melting of polar ice caps, the increase in extreme weather events, and the shifting patterns of plant and animal species.