Yes, the ice core data is an example of proxy data. Proxy data provides insight into the temperature record from well before the instrument period.
Royal Navy logbooks contain a daily record of a ship's position, speed, and weather conditions including temperatures etc. There are 100,000 of these extant from 1660 to 1850 from around the globe. That's a lot of data.
I love the smell of face-palm in the morning!
"You ain't no Muslim bruv!"
Many people who reject climate change do so because of who is on the opposite side.
Many republicans in the past, including the last two presidential candidates accepted that man kind is at least partially to blame for climate change.
If Al Gore wasn't on the opposite side, I guarantee you a large number of antis would accept that man kind is partially to blame. The science isn't what they are against. It's the people. Look at the OP, he didn't even bother to read anything past the first page. Or even go to the original source. They don't give a **** about what the science says either way. It's all about getting back at people they dislike.
"If your opponent is of choleric temperament, seek to irritate him." - Sun Tzu
When climatologist's get my local weather forecast right from day to day, then maybe I'll give them some credence. Til then, you'd do best not to hang your hat on a group of people that have the same collective success rate as a man in a field holding their licked finger in the air and telling you it's going to rain today.
Americans are so enamored of equality that they would rather be equal in slavery than unequal in freedom.
Alexis de Tocqueville