The IPCC (United Nations Intergovernmental Panel on Climate Change) has no geologists among the hundreds of authors of its last major report (2013/14) and at most 1 geologist in the next report. Thus IPCC focuses on only the last 170 years (since multiple reliable thermometer measurements began, ~1850), yet Earth is 26 million (sic) times older, 4.5 billion years. Geologists know that throughout this time Earth has constantly warmed or cooled (never static). Thus 'climate change' (warming or cooling) is perfectly usual. During the last 11,650 years, our current ‘Holocene’ interglacial epoch, climate change has repeatedly been fast enough to cause collapse of civilizations.
The IPCC’s very existence relies on public belief in ‘Anthropogenic (man-made) Global Warming' (AGW) by CO2 emissions. Most IPCC authors, mainly government and university researchers, are biased by strong vested interests in AGW - Anthropogenic Global Warming (publications; reputations; continuance of salaries; research grants).
The "greenhouse effect ... a slight misnomer" (Wiki; in fact a complete misnomer;) ... "is the process by which radiation from a planet's atmosphere warms the planet's surface". This bold claim that Earth's land- and ocean surfaces are warmed by the air is 'backwards'. In truth the (solar-warmed) ocean warms the atmosphere, as shown by three observations: (1) ocean-surface water (covering ~70% of Earth) is almost everywhere warmer (fractionally) than the air above it; (2) changes in global average surface air temperature lag 1 to 1.5 months behind corresponding changes in global sea-surface temperature; and (3) Antarctica has failed to warm in the last several decades (attributed to the ice sheet's high elevation delaying the landward penetration of ocean-warmed air). These facts indicate that heat (only capable of flowing one way, from warmer to cooler) flows outward, from the ocean to the air, not vice versa. A truthful summary of the greenhouse effect is that solar energy absorbed at Earth’s surface is radiated back into the atmosphere as heat, some of which is absorbed on its way out to space by greenhouse gases. Thus greenhouse gases cause no warming; instead they reduce the air's heat loss to space, exactly in the manner demonstrated by the great John Tyndall (Bullet 2B), who experimentally confirmed (1860) what is now called the greenhouse effect.