Since the timeline has recently been updated, and since typos and syntax or formatting errors are very few and far between, I thought I'd give it a proofread and try to catch what little bit is left. Please feel free to comment on my suggestions, or add any of your own, but note that this thread is not the place to debate the content of the timeline: let's avoid discussing the feasibility of FTL travel, or whether California will really go back to Mexico, or how long it may or may not take to reach Type III. This thread is reserved for spelling/grammar/syntax errors, continuity errors, historical errors and other black-and-white fixes we can make to continue to perfect the presentation of Future Timeline.
2009: Barack Obama is sworn in as 44th POTUS: "Barack Obama was elected the 44th president of the U.S. in January 2009, becoming the first African American to hold office" should read "Barack Obama was [color=#ff0000;]inaugurated[/color] the 44th president of the U.S. in January 2009, becoming..." as he was elected in November 2008.
2018: The Transbay Transit Center is completed in San Francisco: This prediction is slightly inconsistent with respect to this one about LA's new tallest building: both predictions claim to build the tallest tower on the American west coast. From the San Francisco one: "Soaring to over 1,000 feet [its exact height is planned at 1,070 feet], it becomes the tallest tower on the American West Coast." LA's Wilshire Grand is 1,100 feet and was completed a year earlier. Wikipedia had the same 'tallest-in-the-west' problem, and solved it nicely: "The tower would be the seventh tallest building in the United States if standing in 2013, and was expected to become the tallest building in the Western United States, although by some measures it will be shorter than the Wilshire Grand Tower, which is planned to open in Los Angeles in 2017." Also, the video on the Transbay Center prediction got removed.
2020: The 5G standard is released: The pictured 2011 release date of the 4th generation seems a bit incongruous with the iPhone's actual 2007 release date. Also, the above link is attached to the 2020 master page, because the link to the 5G standard prediction doesn't work.
2024: Gay marriage is legal in every US state: "By 2015, the number of Americans opposing gay marriage was being exceeded by those in support." Polls on gay marriage in the US have consistently found a majority in support since 2010. Since changing the year directly will force a simultaneous change of the accompanying sentence about legal gains made by 2011, maybe just change the sentence in question to read "By 2015, the number of Americans opposing gay marriage is significantly exceeded by those in support."
2025: Human brain simulations are becoming possible: The y-axis of the graph implies that "FLOPS" stands for "FLoating point OPerationS," when it actually stands for "FLoating point Operations Per Second."
2025: China is becoming highly urbanised: There is an extra comma in this sentence: "The country has prepared for this[color=#ff0000;],[/color] by strengthening relations with Central Asian countries and importing more oil and gas from them, especially Turkmenistan which has made significant new discoveries." After reading it several times, I understand why the comma is there, and you're not breaking any hard grammatical rules by leaving it in, but I think the sentence would make the same point more clearly and concisely without it.
2026: Global reserves of indium are running out: "Indium" should not be capitalized in the last sentence of this prediction.
2028: Resurrection of several extinct species has been achieved: "Dodo" and "Wild Pigeon" should not be capitalized here.
2035: Distributed propulsion systems are revolutionising air travel: Formatting error: the font size changes between the first and second paragraph.
2040: Annual deaths from cardiovascular disease have reached negligible levels in the U.S.: Formatting error: the font size in this prediction is a point or two smaller than the rest of the timeline.
2045: The Chuo Shinkansen high speed maglev route is complete: Formatting error: the font changes on the special characters in the title of this prediction.
2045-2049: Major extinctions of animal and plant life: "Dumping of dredged sediment, as part of the world's largest coal port, has caused further damage." This sentence is unclear, specifically the role of the coal port in the dumping. Alternatively, it could read "Dumping of dredged sediment to help create the world's largest coal port has caused further damage."
2050: Nearly half of the Amazon rainforest has been deforested: In the second paragraph, "Although clean energy sources are offsetting this, it can't save the countless species..." should read "Although clean energy sources are offsetting this, [color=#ff0000;]they[/color] can't save the countless species..."
2082: The USA cedes territory to Mexico: The difference of Mexican behavior with respect to other Latino immigrants is noted twice in this prediction. 1, in the first paragraph below the Mexican flag: "Although many different ethnic groups would arrive, the Mexicans would behave differently. It was this..." and 2, the first sentence of two paragraphs later: "The immigrants from Mexico behaved differently, however. Many became integrated..." I would advise dropping the last two sentences from that first paragraph.
298,000 AD: Voyager 2 is approaching Sirius: "Ecliptic" shouldn't be capitalized here.
That's all I got. Anyone else see any typos or formatting/continuity errors in the timeline?